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I73.01 ICD-10-CM Code: Raynaud's syndrome with gangrene

I73.01 maps to CMS-HCC V28 263. A source-labeled RAF reference is available. Documentation must support MEAT. MEAT criteria · RAF Calculator · HCC coding software

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FY 2026 Apr update / Diseases of the circulatory system (I00-I99) / Diseases of arteries, arterioles and capillaries (I70-I79)

I73.01

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Raynaud's syndrome with gangrene

A condition where blood vessels in the fingers and toes overreact to cold or stress, causing numbness, color changes, and tissue death (gangrene).

Buddy the Bee presenting code insight

Buddy Insight

Raynaud's syndrome with gangrene represents the most severe complication of Raynaud's phenomenon, where severe digital vasospasm has progressed to tissue necrosis and gangrene.

CMS-HCC V28

HCC 263

Code-level coefficient reference

CMS-HCC V24

Historical

Historical

Not used for CY2026 payment

ACA/HHS

HCC 153

Code-level coefficient reference

ESRD/PACE

HCC 106

Code-level coefficient reference

RXHCC

N/A

—

Not mapped

Code Book Path

Official
I73Other peripheral vascular diseases
I73.0Raynaud's syndrome
I73.01Raynaud's syndrome with gangrene

Inclusion Terms

Official
  • Raynaud's disease
  • Raynaud's phenomenon (secondary)

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for I73.01 in this effective period.

Related Child Codes

Official
I73.00Raynaud's syndrome without gangrene

Includes

Official

ICD-10-CM does not list Includes notes for I73.01 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for I73.01 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for I73.01 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for I73.01 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for I73.01 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance
Documentation of Raynaud's syndrome as the underlying cause
Clinical evidence of gangrene (tissue necrosis, demarcation, color changes)
Location and extent of gangrenous changes
Primary vs secondary Raynaud's classification with underlying condition if secondary

MEAT Support

HCC Buddy guidance
Documentation of Raynaud's syndrome as the underlying cause
Clinical evidence of gangrene (tissue necrosis, demarcation, color changes)
Location and extent of gangrenous changes
Primary vs secondary Raynaud's classification with underlying condition if secondary

Audit Caution

HCC Buddy guidance
Coding Raynaud's without gangrene (I73.00) when documentation clearly describes gangrenous changes
Not distinguishing between critical ischemia and actual gangrene — gangrene requires tissue necrosis documentation
Failing to code the underlying cause of secondary Raynaud's (scleroderma, lupus) as an additional diagnosis
Using the unspecified gangrene code I96 when Raynaud's is the documented etiology

Common Mistakes

HCC Buddy guidance
I73.00 — Raynaud's syndrome without gangrene: does not include tissue necrosis — significantly lower severity
I96 — Gangrene, not elsewhere classified: use when gangrene etiology is non-Raynaud's
I70.26x — Atherosclerosis of native arteries of extremities with gangrene: atherosclerotic etiology rather than vasospastic
I73.1 — Thromboangiitis obliterans (Buerger's disease): different underlying pathology causing digital ischemia

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is I73.01 an HCC code?

Yes. I73.01 (Raynaud's syndrome with gangrene) maps to HCC 263, Atherosclerosis of Arteries of the Extremities with Ulceration or Gangrene under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 1.118. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.

Coder answer: I73.01 is billable and maps to V28 HCC 263, Atherosclerosis of Arteries of the Extremities with Ulceration or Gangrene. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code
I73.01
Description
Raynaud's syndrome with gangrene
HCC (V28)
HCC 263 — Atherosclerosis of Arteries of the Extremities with Ulceration or Gangrene
RAF reference coefficient
1.118
Billable
Yes
Payment year
2026

HCC Category Mapping

V28HCC 263, Atherosclerosis of Arteries of the Extremities with Ulceration or Gangrene
1.118
ESRDHCC 106, Atherosclerosis of the Extremities with Ulceration or Gangrene
Not separately weighted

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work I73.01 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT Criteria for I73.01

For I73.01 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

  • MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
  • EEvaluate: test results, medication response, or physical findings reviewed by the provider
  • AAssess: explicit mention in the assessment or plan with acknowledgment of status
  • TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed I73.01 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

I73.01 is the ICD-10-CM diagnosis code for raynaud's syndrome with gangrene. A condition where blood vessels in the fingers and toes overreact to cold or stress, causing numbness, color changes, and tissue death (gangrene). I73.01 sits in the ICD-10-CM chapter for diseases of the circulatory system (i00-i99), within the section covering diseases of arteries, arterioles and capillaries (i70-i79).

Under the CMS-HCC V28 risk adjustment model, I73.01 maps to Atherosclerosis of Arteries of the Extremities with Ulceration or Gangrene (HCC 263) with a source-labeled community, non-dual, aged reference coefficient of 1.118. No V24 mapping is shown for I73.01; use the applicable model and payment year when reviewing the V28 mapping. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.

Verify that gangrene is documented; this is a more severe form than I73.00. Because I73.01 maps to an HCC category, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) before the diagnosis is used for risk adjustment. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for I73.01 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

  • •Verify that gangrene is documented; this is a more severe form than I73.00
  • •Consider coding additional codes for the specific sites of gangrene if applicable

Clinical Significance

Raynaud's syndrome with gangrene represents the most severe complication of Raynaud's phenomenon, where severe digital vasospasm has progressed to tissue necrosis and gangrene. This indicates advanced vascular compromise that may require amputation and reflects a significantly higher disease burden than uncomplicated Raynaud's. The gangrene component elevates this to a high-impact HCC category.

Documentation Requirements

  • ✓Documentation of Raynaud's syndrome as the underlying cause
  • ✓Clinical evidence of gangrene (tissue necrosis, demarcation, color changes)
  • ✓Location and extent of gangrenous changes
  • ✓Primary vs secondary Raynaud's classification with underlying condition if secondary
  • ✓Treatment documentation (vasodilators, sympathectomy, wound care, amputation if applicable)
  • ✓Vascular studies (digital pressures, cold stimulation testing) if available

Commonly Confused Codes

  • •I73.00: Raynaud's syndrome without gangrene: does not include tissue necrosis: significantly lower severity
  • •I96: Gangrene, not elsewhere classified: use when gangrene etiology is non-Raynaud's
  • •I70.26x: Atherosclerosis of native arteries of extremities with gangrene: atherosclerotic etiology rather than vasospastic
  • •I73.1: Thromboangiitis obliterans (Buerger's disease): different underlying pathology causing digital ischemia

Child Codes

I73.00Raynaud's syndrome without gangrene
I73.01Raynaud's syndrome with gangrene
HCC 263

Code Hierarchy

└I73Other peripheral vascular diseases└I73.0Raynaud's syndrome└I73.01Raynaud's syndrome with gangrene
└I73.01Raynaud's syndrome with gangrene

Because I73.01 maps to an HCC category, the documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) before the diagnosis is used for risk adjustment.

I73.01 maps to CMS-HCC V28 category 263, Atherosclerosis of Arteries of the Extremities with Ulceration or Gangrene. See the ICD-10 to HCC mapping hub for how the V28 crosswalk works. The mapping identifies a payment HCC category for I73.01. Review its source-labeled HCC coefficient above, check the RAF Calculator with complete member context for CMS-HCC V28 PY2026, and confirm the documentation the chart needs before the code is submitted. HCC Buddy shows no RAF score unless every required source and calculation check passes.

More on I73.01

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