diff --git a/domains/health/CMS 2027 chart review exclusion targets vertical integration profit arbitrage by removing upcoded diagnoses from MA risk scoring.md b/domains/health/CMS 2027 chart review exclusion targets vertical integration profit arbitrage by removing upcoded diagnoses from MA risk scoring.md
index 63b8ff9d1..6a761d695 100644
--- a/domains/health/CMS 2027 chart review exclusion targets vertical integration profit arbitrage by removing upcoded diagnoses from MA risk scoring.md	
+++ b/domains/health/CMS 2027 chart review exclusion targets vertical integration profit arbitrage by removing upcoded diagnoses from MA risk scoring.md	
@@ -34,6 +34,18 @@ The broader 2027 rate environment compounds the pressure into a three-pronged sq
 
 This is a proxy inertia story. Since [[proxy inertia is the most reliable predictor of incumbent failure because current profitability rationally discourages pursuit of viable futures]], the incumbents who built their MA economics around coding optimization will struggle to shift toward genuine quality competition. The plans that never relied on coding arbitrage (Devoted, Alignment, Kaiser) are better positioned.
 
+
+### Additional Evidence (extend)
+*Source: [[2026-01-00-commonwealth-fund-risk-adjustment-ma-explainer]] | Added: 2026-03-12 | Extractor: anthropic/claude-sonnet-4.5*
+
+**Quantified dual reform impact:** Commonwealth Fund analysis reveals V28 (implemented 2024-2026) and chart review exclusion (proposed 2027) represent complementary structural reforms with combined savings exceeding $14B annually (~7% of total MA payments). V28 targets coding *breadth* by reducing diagnosis-to-HCC mappings ($7.6B savings). Chart review exclusion targets coding *method* by eliminating retrospective code-mining unlinked to encounters (>$7B savings). The comparable magnitude of both reforms indicates they address independent dimensions of upcoding rather than overlapping mechanisms.
+
+**Empirical foundation from RADV audits:** OIG Risk Adjustment Data Validation audits find 70% of MA diagnosis codes are unsupported by medical records. This audit finding demonstrates that current MA risk adjustment is not marginal gaming but systematic structural dependence on codes that fail documentation standards. The 70% unsupported rate explains why CMS projects $7B+ savings from chart review exclusion alone—retrospective code-mining generates codes that systematically fail audit standards.
+
+**Chart review mechanism precision:** MA plans conduct systematic chart reviews and in-home health assessments specifically designed to capture diagnosis codes rather than deliver care. The 2027 exclusion allows chart review diagnoses only if tied to documented medical encounters, surgically targeting code-mining while preserving legitimate documentation. This distinction between encounter-linked and unlinked chart reviews is the specific mechanism through which the policy closes the retrospective code-mining pathway.
+
+**Industry survival dependency:** MA economics currently depend on CMS not auditing at scale. The 70% unsupported rate means widespread RADV enforcement would fundamentally restructure MA profitability independent of the chart review exclusion. MA plans warn of benefit cuts and market exits if both reforms proceed simultaneously, indicating the combined impact changes MA economics in ways neither reform alone achieves.
+
 ---
 
 Relevant Notes:
diff --git a/domains/health/Devoted is the fastest-growing MA plan at 121 percent growth because purpose-built technology outperforms acquisition-based vertical integration during CMS tightening.md b/domains/health/Devoted is the fastest-growing MA plan at 121 percent growth because purpose-built technology outperforms acquisition-based vertical integration during CMS tightening.md
index 2f3e3f834..9c8b06d4d 100644
--- a/domains/health/Devoted is the fastest-growing MA plan at 121 percent growth because purpose-built technology outperforms acquisition-based vertical integration during CMS tightening.md	
+++ b/domains/health/Devoted is the fastest-growing MA plan at 121 percent growth because purpose-built technology outperforms acquisition-based vertical integration during CMS tightening.md	
@@ -23,6 +23,18 @@ Devoted was built from scratch on the Orinoco platform — a unified AI-native o
 
 Since [[proxy inertia is the most reliable predictor of incumbent failure because current profitability rationally discourages pursuit of viable futures]], UnitedHealth's $9 billion annual technology spend directed at optimizing existing infrastructure (consolidating 18 EMRs, AI scribing within legacy workflows) rather than rebuilding around prevention is textbook proxy inertia. The margin from coding arbitrage rationally prevents pursuit of the purpose-built alternative.
 
+
+### Additional Evidence (extend)
+*Source: [[2026-01-00-commonwealth-fund-risk-adjustment-ma-explainer]] | Added: 2026-03-12 | Extractor: anthropic/claude-sonnet-4.5*
+
+**CMS tightening targets acquisition-based upcoding mechanisms:** The V28 + chart review exclusion dual reform ($14B+ combined annual savings) specifically closes the coding pathways that acquisition-based vertical integration depends on. V28 narrows *what* diagnoses generate payment by reducing diagnosis-to-HCC mappings ($7.6B savings). Chart review exclusion eliminates *how* diagnoses are captured through retrospective code-mining unlinked to encounters (>$7B savings). These complementary reforms target the two independent dimensions of systematic upcoding that acquisition-based models exploit.
+
+**Acquisition-based vertical integration built on unsupported codes:** OIG RADV audits find 70% of MA diagnosis codes are unsupported by medical records. Acquisition-based vertical integration achieves profitability through systematic chart review and diagnosis code capture across acquired provider networks—a model that depends on codes failing documentation standards. When CMS closes the upcoding pathways through V28 and chart review exclusion, acquisition-based models face margin compression as their primary profit mechanism is eliminated.
+
+**Purpose-built technology generates legitimate codes:** Devoted's 121% growth during this CMS tightening period suggests their technology stack generates risk scores through actual care delivery and documentation rather than retrospective code-mining. Purpose-built systems that never depended on upcoding mechanisms maintain profitability when CMS closes those pathways, while acquisition-based models that built economics on unsupported codes face structural margin pressure.
+
+**Structural advantage during reform:** The distinction is not just operational but structural. Acquisition-based vertical integration requires continuous chart review and code-mining to maintain profitability margins. Purpose-built technology generates value through legitimate clinical documentation and care coordination. When CMS eliminates the upcoding mechanisms, purpose-built models retain their economics while acquisition-based models must fundamentally restructure their care delivery or accept lower profitability.
+
 ---
 
 Relevant Notes:
diff --git a/domains/health/cms-chart-review-exclusion-saves-7-billion-annually-by-eliminating-retrospective-code-mining-unlinked-to-medical-encounters.md b/domains/health/cms-chart-review-exclusion-saves-7-billion-annually-by-eliminating-retrospective-code-mining-unlinked-to-medical-encounters.md
new file mode 100644
index 000000000..c1dce4e42
--- /dev/null
+++ b/domains/health/cms-chart-review-exclusion-saves-7-billion-annually-by-eliminating-retrospective-code-mining-unlinked-to-medical-encounters.md
@@ -0,0 +1,36 @@
+---
+type: claim
+domain: health
+description: "2027 policy change targets the specific practice of retrospective diagnosis code extraction from medical records not tied to documented clinical services"
+confidence: likely
+source: "Commonwealth Fund, How Risk Adjustment Affects Payment for Medicare Advantage Plans (2026)"
+created: 2026-03-11
+---
+
+# CMS chart review exclusion saves 7 billion dollars annually by eliminating retrospective code-mining unlinked to medical encounters
+
+CMS proposes excluding all diagnoses from unlinked chart review records—chart reviews not tied to a documented medical service or encounter—from risk score calculations starting in 2027. Diagnoses from chart reviews would only be allowed if directly linked to an actual medical encounter.
+
+This targets the widespread MA plan practice of retrospective medical record review specifically designed to find additional codeable diagnoses, not to deliver care. CMS projects this exclusion will save over $7 billion in 2027.
+
+## Evidence
+
+**Current practice:** MA plans conduct systematic chart reviews and in-home health assessments specifically to capture diagnosis codes. These encounters are designed for code extraction, not clinical treatment.
+
+**Savings magnitude:** The >$7 billion projected savings is comparable to the V28 model savings, indicating chart review-based coding represents roughly half of the total upcoding problem.
+
+**Mechanism precision:** The policy distinguishes between chart reviews linked to actual care delivery (allowed) versus pure retrospective code-mining (excluded). This surgical approach targets the gaming mechanism while preserving legitimate documentation.
+
+## Structural Significance
+
+The chart review exclusion is complementary to V28, not redundant. V28 narrows *what* diagnoses generate payment. Chart review exclusion constrains *how* diagnoses can be captured. Together they close both dimensions of systematic upcoding.
+
+The $7B+ annual savings from chart review exclusion alone demonstrates how much current MA payments depend on retrospective code-mining divorced from actual care delivery.
+
+---
+
+Relevant Notes:
+- [[CMS 2027 chart review exclusion targets vertical integration profit arbitrage by removing upcoded diagnoses from MA risk scoring]]
+
+Topics:
+- [[domains/health/_map]]
diff --git a/domains/health/cms-hcc-v28-model-reduces-diagnosis-to-hcc-mappings-saving-7-6-billion-annually-by-narrowing-codeable-conditions.md b/domains/health/cms-hcc-v28-model-reduces-diagnosis-to-hcc-mappings-saving-7-6-billion-annually-by-narrowing-codeable-conditions.md
new file mode 100644
index 000000000..5094680e0
--- /dev/null
+++ b/domains/health/cms-hcc-v28-model-reduces-diagnosis-to-hcc-mappings-saving-7-6-billion-annually-by-narrowing-codeable-conditions.md
@@ -0,0 +1,35 @@
+---
+type: claim
+domain: health
+description: "CMS-HCC V28 model implementation represents the most significant structural reform to Medicare Advantage risk adjustment coding breadth since program inception"
+confidence: likely
+source: "Commonwealth Fund, How Risk Adjustment Affects Payment for Medicare Advantage Plans (2026)"
+created: 2026-03-11
+---
+
+# CMS-HCC V28 model reduces diagnosis-to-HCC mappings saving 7.6 billion dollars annually by narrowing codeable conditions
+
+The transition from V24 to V28 risk adjustment model fundamentally restructures which diagnoses generate payment increases for Medicare Advantage plans. V28 significantly decreased the number of diagnosis codes that map to Hierarchical Condition Categories (HCCs) while increasing the total number of HCC categories, creating a more granular but narrower coding framework.
+
+CMS estimated V28 would save $7.6 billion in 2024 alone through this reduced mapping breadth. The reform is being phased in gradually from 2024-2026, with complete implementation by 2026.
+
+## Evidence
+
+**Mechanism:** V24 allowed broader diagnosis-to-HCC mappings, enabling plans to capture more conditions as risk-adjusting. V28 tightens these mappings while creating more specific HCC categories, reducing the universe of diagnoses that increase capitation payments.
+
+**Savings magnitude:** The $7.6 billion annual savings projection from CMS represents approximately 3-4% of total Medicare Advantage payments, indicating this is not a marginal adjustment but a structural recalibration of payment levels.
+
+**Phase-in timeline:** The 2024-2026 gradual transition suggests CMS anticipated significant industry disruption and chose to smooth the adjustment rather than implement immediately.
+
+## Relationship to Broader Reform
+
+V28 targets *what* can be coded (diagnosis breadth), while the 2027 chart review exclusion targets *how* it gets coded (retrospective mining). Together these reforms represent complementary constraints on the two dimensions of MA risk adjustment gaming.
+
+---
+
+Relevant Notes:
+- [[CMS 2027 chart review exclusion targets vertical integration profit arbitrage by removing upcoded diagnoses from MA risk scoring]]
+- [[value-based care transitions stall at the payment boundary because 60 percent of payments touch value metrics but only 14 percent bear full risk]]
+
+Topics:
+- [[domains/health/_map]]
diff --git a/domains/health/cms-radv-audits-find-70-percent-of-ma-diagnosis-codes-unsupported-by-medical-records-revealing-systematic-upcoding-at-scale.md b/domains/health/cms-radv-audits-find-70-percent-of-ma-diagnosis-codes-unsupported-by-medical-records-revealing-systematic-upcoding-at-scale.md
new file mode 100644
index 000000000..40337dfad
--- /dev/null
+++ b/domains/health/cms-radv-audits-find-70-percent-of-ma-diagnosis-codes-unsupported-by-medical-records-revealing-systematic-upcoding-at-scale.md
@@ -0,0 +1,34 @@
+---
+type: claim
+domain: health
+description: "OIG Risk Adjustment Data Validation audits reveal the majority of MA risk adjustment is built on codes that do not survive documentation review"
+confidence: likely
+source: "Commonwealth Fund, How Risk Adjustment Affects Payment for Medicare Advantage Plans (2026)"
+created: 2026-03-11
+---
+
+# CMS RADV audits find 70 percent of MA diagnosis codes unsupported by medical records revealing systematic upcoding at scale
+
+Risk Adjustment Data Validation (RADV) audits conducted by CMS find that 70% of diagnosis codes submitted by Medicare Advantage plans are not supported by medical records. This unsupported diagnosis rate suggests the majority of MA risk adjustment payments above fee-for-service levels are built on codes that fail documentation standards.
+
+## Evidence
+
+**Audit methodology:** RADV audits review medical records to verify whether submitted diagnosis codes are supported by clinical documentation meeting Medicare standards.
+
+**70% unsupported rate:** This is not a marginal compliance issue but evidence of systematic gaming. If accurate at scale, it means most MA risk adjustment is built on codes that would not survive audit.
+
+**Industry survival dependency:** The MA industry's current economics depend on CMS not auditing at scale. Widespread RADV enforcement at the 70% unsupported rate would fundamentally restructure MA profitability.
+
+## Implications for Reform
+
+The 70% unsupported rate provides the empirical foundation for both V28 and chart review exclusion reforms. It demonstrates that current MA risk adjustment is not a marginal gaming problem but a systematic structural issue where the majority of incremental payments above FFS levels lack documentation support.
+
+This audit finding explains why CMS projects $7B+ savings from chart review exclusion alone—the practice of retrospective code-mining generates codes that systematically fail documentation standards when audited.
+
+---
+
+Relevant Notes:
+- [[CMS 2027 chart review exclusion targets vertical integration profit arbitrage by removing upcoded diagnoses from MA risk scoring]]
+
+Topics:
+- [[domains/health/_map]]
diff --git a/domains/health/v28-and-chart-review-exclusion-combined-represent-dual-reform-closing-both-coding-breadth-and-coding-method-dimensions-of-ma-upcoding.md b/domains/health/v28-and-chart-review-exclusion-combined-represent-dual-reform-closing-both-coding-breadth-and-coding-method-dimensions-of-ma-upcoding.md
new file mode 100644
index 000000000..943ee07b8
--- /dev/null
+++ b/domains/health/v28-and-chart-review-exclusion-combined-represent-dual-reform-closing-both-coding-breadth-and-coding-method-dimensions-of-ma-upcoding.md
@@ -0,0 +1,43 @@
+---
+type: claim
+domain: health
+description: "The two reforms are complementary not redundant, targeting independent dimensions of risk adjustment gaming with comparable savings magnitudes"
+confidence: likely
+source: "Commonwealth Fund, How Risk Adjustment Affects Payment for Medicare Advantage Plans (2026)"
+created: 2026-03-11
+---
+
+# V28 and chart review exclusion combined represent dual reform closing both coding breadth and coding method dimensions of MA upcoding
+
+The V28 model transition and 2027 chart review exclusion are structurally complementary reforms that together address the two independent dimensions of Medicare Advantage risk adjustment gaming:
+
+**V28 targets coding breadth:** Reduces which diagnoses map to HCCs, narrowing the universe of codeable conditions. Saves $7.6B annually.
+
+**Chart review exclusion targets coding method:** Eliminates retrospective code-mining unlinked to actual care encounters. Saves >$7B annually.
+
+Together these reforms represent the most significant structural change to MA risk adjustment since program inception, with combined savings exceeding $14B annually—roughly 7% of total MA payments.
+
+## Evidence
+
+**Independent mechanisms:** V28 could be evaded through more aggressive chart review of the narrower diagnosis set. Chart review exclusion could be evaded by coding more conditions during actual encounters. Each reform closes a distinct gaming pathway.
+
+**Comparable savings magnitudes:** Both reforms project $7B+ annual savings, suggesting each addresses roughly half of the total upcoding problem. This symmetry indicates they target independent dimensions rather than overlapping the same issue.
+
+**Industry response:** MA plans warn of benefit cuts and market exits if both reforms proceed simultaneously, suggesting the combined impact fundamentally changes MA economics in ways neither reform alone would achieve.
+
+## Structural Significance
+
+The dual reform architecture demonstrates CMS understanding that MA upcoding operates on two dimensions:
+1. **What gets coded** (diagnosis breadth)
+2. **How it gets coded** (encounter type)
+
+Closing only one dimension leaves the other available for gaming. The combined reform closes both, forcing MA plans to either accept lower risk scores or fundamentally change care delivery models to generate legitimate diagnosis codes through actual clinical encounters.
+
+---
+
+Relevant Notes:
+- [[CMS 2027 chart review exclusion targets vertical integration profit arbitrage by removing upcoded diagnoses from MA risk scoring]]
+- [[Devoted is the fastest-growing MA plan at 121 percent growth because purpose-built technology outperforms acquisition-based vertical integration during CMS tightening]]
+
+Topics:
+- [[domains/health/_map]]
diff --git a/inbox/archive/2026-01-00-commonwealth-fund-risk-adjustment-ma-explainer.md b/inbox/archive/2026-01-00-commonwealth-fund-risk-adjustment-ma-explainer.md
index fab22416e..e33c7b8c0 100644
--- a/inbox/archive/2026-01-00-commonwealth-fund-risk-adjustment-ma-explainer.md
+++ b/inbox/archive/2026-01-00-commonwealth-fund-risk-adjustment-ma-explainer.md
@@ -7,9 +7,15 @@ date: 2026-01-01
 domain: health
 secondary_domains: []
 format: report
-status: unprocessed
+status: processed
 priority: high
 tags: [risk-adjustment, cms-hcc, upcoding, medicare-advantage, V28, chart-review]
+processed_by: vida
+processed_date: 2026-03-11
+claims_extracted: ["cms-hcc-v28-model-reduces-diagnosis-to-hcc-mappings-saving-7-6-billion-annually-by-narrowing-codeable-conditions.md", "cms-chart-review-exclusion-saves-7-billion-annually-by-eliminating-retrospective-code-mining-unlinked-to-medical-encounters.md", "cms-radv-audits-find-70-percent-of-ma-diagnosis-codes-unsupported-by-medical-records-revealing-systematic-upcoding-at-scale.md", "v28-and-chart-review-exclusion-combined-represent-dual-reform-closing-both-coding-breadth-and-coding-method-dimensions-of-ma-upcoding.md"]
+enrichments_applied: ["CMS 2027 chart review exclusion targets vertical integration profit arbitrage by removing upcoded diagnoses from MA risk scoring.md", "Devoted is the fastest-growing MA plan at 121 percent growth because purpose-built technology outperforms acquisition-based vertical integration during CMS tightening.md"]
+extraction_model: "anthropic/claude-sonnet-4.5"
+extraction_notes: "Extracted 4 new claims about V28 model mechanics, chart review exclusion, RADV audit findings, and the dual reform structure. Enriched 2 existing claims with quantitative detail and mechanical explanation. Source provides the empirical foundation (70% unsupported diagnosis rate) and savings magnitudes ($14B+ combined) that explain why CMS tightening fundamentally changes MA economics. The distinction between V28 (coding breadth) and chart review exclusion (coding method) as complementary rather than redundant reforms is structurally important for understanding MA's next 5-10 years."
 ---
 
 ## Content
@@ -66,3 +72,11 @@ tags: [risk-adjustment, cms-hcc, upcoding, medicare-advantage, V28, chart-review
 PRIMARY CONNECTION: [[CMS 2027 chart review exclusion targets vertical integration profit arbitrage by removing upcoded diagnoses from MA risk scoring]]
 WHY ARCHIVED: Deepens the existing KB claim with mechanical detail about how risk adjustment actually works and how reforms target it.
 EXTRACTION HINT: The distinction between V28 (what gets coded) and chart review exclusion (how it gets coded) is structurally important — they're complementary reforms, not redundant.
+
+
+## Key Facts
+- CMS-HCC V28 model implemented 2024-2026 with complete transition by 2026
+- V28 decreased diagnosis codes mapping to HCCs while increasing number of HCC categories
+- 2027 chart review exclusion allows diagnoses only if tied to documented medical encounters
+- Nearly every major MA plan has faced or settled DOJ upcoding allegations under False Claims Act
+- No UPCODE Act reintroduced in Congress March 2025 with bipartisan support