What is ICD-10 code I70.763?

I70.763 is the ICD-10-CM diagnosis code for Atherosclerosis of other type of bypass graft(s) of the extremities with gangrene, bilateral legs. Hardening and narrowing of a surgical bypass graft affecting both legs with tissue death (gangrene) in both extremities due to blocked blood flow. I70.763 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. I70.763 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. I70.763 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. I70.763 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does I70.763 map to under V28?

I70.763 maps to CMS-HCC V28 HCC 263 (Atherosclerosis of Arteries of the Extremities with Ulceration or Gangrene). The category numbers, labels, and conditions come from the CMS-HCC V28 model file for payment year 2026.

What documentation supports I70.763?

Confirm documentation explicitly states bilateral involvement and gangrene in both legs This bilateral presentation indicates severe systemic atherosclerotic disease and typically requires immediate vascular intervention Because I70.763 maps to an HCC category, the documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) before the diagnosis is used for risk adjustment. See the MEAT criteria checklist at /meat-criteria for what Monitor, Evaluate, Assess, or Treat looks like in a note. MEAT is generic documentation evidence, not a payer-specific rule.

2026 ICD-10-CM I70.763: Atherosclerosis of other

I70.763 maps to CMS-HCC V28 263. A source-labeled RAF reference is available. Documentation must support MEAT. MEAT criteria · RAF Calculator · HCC coding software

ICD-10-CM Code View

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Code lookupI70.763Effective periodFY2026 Apr Update (Apr 1-Sep 30)

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

I70.763

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

Atherosclerosis of other type of bypass graft(s) of the extremities with gangrene, bilateral legs

Hardening and narrowing of a surgical bypass graft affecting both legs with tissue death (gangrene) in both extremities due to blocked blood flow.

Buddy Insight

Atherosclerosis of other type bypass graft with gangrene of the bilateral legs represents the most severe stage of peripheral arterial disease (Fontaine Stage IV with tissue necrosis).

CMS-HCC V28

Mapped

HCC 263

Atherosclerosis of Arteries o...

Code-level coefficient reference

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

I70.7Atherosclerosis of other type of bypass graft(s) of the extremities

I70.76Atherosclerosis of other type of bypass graft(s) of the extremities with gangrene

I70.763Atherosclerosis of other type of bypass graft(s) of the extremities with gangrene, bilateral legs

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for I70.763 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for I70.763 in this effective period.

Related Child Codes

Official

I70.761Atherosclerosis of other type of bypass graft(s) of the extremities with gangrene, right leg

I70.762Atherosclerosis of other type of bypass graft(s) of the extremities with gangrene, left leg

I70.768Atherosclerosis of other type of bypass graft(s) of the extremities with gangrene, other extremity

I70.769Atherosclerosis of other type of bypass graft(s) of the extremities with gangrene, unspecified extremity

Includes

Official

any condition classifiable to I70.71-, I70.72-, I70.73-, I70.74-, I70.75
chronic limb-threatening ischemia of other type of bypass graft(s) of the extremities with gangrene
critical limb ischemia of other type of bypass graft(s) of the extremities with gangrene

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for I70.763 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for I70.763 in this effective period.

Use Additional

Official

code to identify the severity of any ulcer (L97.-, L98.49-), if applicable

Code Also

Official

ICD-10-CM does not list Code Also instructions for I70.763 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Gangrene explicitly documented in the bilateral legs — wet or dry gangrene specified when possible

Atherosclerotic disease of other type bypass graft(s) confirmed as the underlying cause

Laterality documented: bilateral legs

Type of bypass graft specified (synthetic, composite, or other non-vein/non-biological type)

MEAT Support

HCC Buddy guidance

Gangrene explicitly documented in the bilateral legs — wet or dry gangrene specified when possible

Atherosclerotic disease of other type bypass graft(s) confirmed as the underlying cause

Laterality documented: bilateral legs

Type of bypass graft specified (synthetic, composite, or other non-vein/non-biological type)

Audit Caution

HCC Buddy guidance

Coding ulceration (I70.731-I70.749) when gangrene is present — gangrene codes supersede ulceration codes as they represent more severe disease and capture higher HCC weights

Selecting wrong graft type — 'other type' is specifically for synthetic or composite grafts, not autologous vein or nonautologous biological

Failing to also code any coexisting ulceration — gangrene codes include rest pain and ulceration, but additional L97.- codes may still be needed for ulcer specificity

Missing the opportunity to capture this high-impact diagnosis when gangrene is documented alongside bypass graft atherosclerosis

Common Mistakes

HCC Buddy guidance

I70.661/I70.662/I70.669 — Atherosclerosis of nonautologous biological bypass graft with gangrene (different graft type)

I70.561/I70.562/I70.569 — Atherosclerosis of autologous vein bypass graft with gangrene (different graft type — autologous vein)

I70.261/I70.262/I70.269 — Atherosclerosis of native arteries with gangrene (native artery, not bypass graft)

I70.361/I70.362/I70.369 — Atherosclerosis of unspecified type bypass graft with gangrene (less specific graft type)

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 I70.763 an HCC code?

Yes. I70.763 (Atherosclerosis of other type of bypass graft(s) of the extremities with gangrene, bilateral legs) 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: I70.763 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: I70.763
Description: Atherosclerosis of other type of bypass graft(s) of the extremities with gangrene, bilateral legs
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

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 I70.763 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT Criteria for I70.763

For I70.763 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 I70.763 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

I70.763 is the ICD-10-CM diagnosis code for atherosclerosis of other type of bypass graft(s) of the extremities with gangrene, bilateral legs. Hardening and narrowing of a surgical bypass graft affecting both legs with tissue death (gangrene) in both extremities due to blocked blood flow. I70.763 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, I70.763 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 I70.763; 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.

Confirm documentation explicitly states bilateral involvement and gangrene in both legs. Because I70.763 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 I70.763 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Confirm documentation explicitly states bilateral involvement and gangrene in both legs
•This bilateral presentation indicates severe systemic atherosclerotic disease and typically requires immediate vascular intervention

Clinical Significance

Atherosclerosis of other type bypass graft with gangrene of the bilateral legs represents the most severe stage of peripheral arterial disease (Fontaine Stage IV with tissue necrosis). Gangrene indicates irreversible tissue death from critical ischemia, carrying high risk for major amputation, sepsis, and mortality. This is a high-acuity condition requiring urgent vascular intervention, aggressive wound management, and often surgical amputation, making it one of the most impactful vascular HCC codes for risk adjustment.

Documentation Requirements

✓Gangrene explicitly documented in the bilateral legs — wet or dry gangrene specified when possible
✓Atherosclerotic disease of other type bypass graft(s) confirmed as the underlying cause
✓Laterality documented: bilateral legs
✓Type of bypass graft specified (synthetic, composite, or other non-vein/non-biological type)
✓Extent of gangrenous tissue described (digits, forefoot, limb segment)
✓Additional code(s) to identify severity of any associated ulceration (L97.-, L98.49-) when ulcers coexist
✓Treatment plan documented (amputation level, revascularization attempts, wound care, antibiotic therapy)
✓Vascular studies or surgical findings supporting the diagnosis

Commonly Confused Codes

•I70.661/I70.662/I70.669: Atherosclerosis of nonautologous biological bypass graft with gangrene (different graft type)
•I70.561/I70.562/I70.569: Atherosclerosis of autologous vein bypass graft with gangrene (different graft type: autologous vein)
•I70.261/I70.262/I70.269: Atherosclerosis of native arteries with gangrene (native artery, not bypass graft)
•I70.361/I70.362/I70.369: Atherosclerosis of unspecified type bypass graft with gangrene (less specific graft type)
•I96: Gangrene, not elsewhere classified (use when gangrene is not due to atherosclerosis of bypass graft)