Skip to content
HCC Buddy home

FY2027 ICD-10-CM reference

I70.55: Atherosclerosis of nonautologous biological bypass graft(s) of other extremity with ulceration

By the HCC Buddy Coding Team

The official ICD-10-CM descriptor is Atherosclerosis of nonautologous biological bypass graft(s) of other extremity with ulceration. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.

Billable code. Verified against the official FY2027 order file.

CMS-HCC V28

  • HCC 263: Atherosclerosis of Arteries of the Extremities with Ulceration or Gangrene · RAF 1.118, Community Non-Dual Aged (CNA)
  • HCC 383: Chronic Ulcer of Skin, Except Pressure, Not Specified as Through to Bone or Muscle · RAF 0.646, Community Non-Dual Aged (CNA)

Payment year 2027, 2026 dates of service. HCC from the CMS 2027 Initial ICD-10-CM Mappings; RAF from the CMS-HCC V28 relative factors. For 2027 dates of service, CMS has not yet published the payment year 2028 mappings.

  • This code has a CMS age requirement: applies when age >= 15

CMS-HCC V24

Not used for payment year 2027 Medicare Advantage payment

ESRD

  • HCC 106: Atherosclerosis of the Extremities with Ulceration or Gangrene
  • HCC 161: Chronic Ulcer of Skin/Except Pressure
  • This code has a CMS age requirement: applies when age >= 15

No RAF is shown: it depends on the member. Mapping: PY2026 CMS mapping; CMS 2027 initial file unchanged.

PACE

Source verification pending

RxHCC

  • HCC 311: Chronic Ulcer of Skin, Except Pressure
  • This code has a CMS age requirement: applies when age >= 15

No RAF is shown: it depends on the member. Mapping: PY2026 CMS mapping; CMS 2027 initial file unchanged.

HHS-HCC

  • HCC 153: HHS-HCC 153
  • HCC 217: HHS-HCC 217
  • This code has a CMS age requirement: applies when age >= 15

No RAF is shown: it depends on the member. Mapping: HHS-HCC 2026 benefit year.

FY2027 Tabular instructions

Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.

Excludes2

certain conditions originating in the perinatal period (P04-P96)

Source: I00-I99 (chapter, inherited).

Excludes2

certain infectious and parasitic diseases (A00-B99)

Source: I00-I99 (chapter, inherited).

Excludes2

complications of pregnancy, childbirth and the puerperium (O00-O9A)

Source: I00-I99 (chapter, inherited).

Excludes2

congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)

Source: I00-I99 (chapter, inherited).

Excludes2

endocrine, nutritional and metabolic diseases (E00-E88)

Source: I00-I99 (chapter, inherited).

Excludes2

injury, poisoning and certain other consequences of external causes (S00-T88)

Source: I00-I99 (chapter, inherited).

Excludes2

neoplasms (C00-D49)

Source: I00-I99 (chapter, inherited).

Excludes2

symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: I00-I99 (chapter, inherited).

Excludes2

systemic connective tissue disorders (M30-M36)

Source: I00-I99 (chapter, inherited).

Excludes2

transient cerebral ischemic attacks and related syndromes (G45.-)

Source: I00-I99 (chapter, inherited).

Includes

arteriolosclerosis

Source: I70 (category, inherited).

Includes

arterial degeneration

Source: I70 (category, inherited).

Includes

arteriosclerosis

Source: I70 (category, inherited).

Includes

arteriosclerotic vascular disease

Source: I70 (category, inherited).

Includes

arteriovascular degeneration

Source: I70 (category, inherited).

Includes

atheroma

Source: I70 (category, inherited).

Includes

endarteritis deformans or obliterans

Source: I70 (category, inherited).

Includes

senile arteritis

Source: I70 (category, inherited).

Includes

senile endarteritis

Source: I70 (category, inherited).

Includes

vascular degeneration

Source: I70 (category, inherited).

Instructional note

code to identify:

Source: I70 (category, inherited).

Instructional note

exposure to environmental tobacco smoke (Z77.22)

Source: I70 (category, inherited).

Instructional note

history of tobacco dependence (Z87.891)

Source: I70 (category, inherited).

Instructional note

occupational exposure to environmental tobacco smoke (Z57.31)

Source: I70 (category, inherited).

Instructional note

tobacco dependence (F17.-)

Source: I70 (category, inherited).

Instructional note

tobacco use (Z72.0)

Source: I70 (category, inherited).

Excludes2

arteriosclerotic cardiovascular disease (I25.1-)

Source: I70 (category, inherited).

Excludes2

arteriosclerotic heart disease (I25.1-)

Source: I70 (category, inherited).

Excludes2

atheroembolism (I75.-)

Source: I70 (category, inherited).

Excludes2

cerebral atherosclerosis (I67.2)

Source: I70 (category, inherited).

Excludes2

coronary atherosclerosis (I25.1-)

Source: I70 (category, inherited).

Excludes2

mesenteric atherosclerosis (K55.1)

Source: I70 (category, inherited).

Excludes2

precerebral atherosclerosis (I67.2)

Source: I70 (category, inherited).

Excludes2

primary pulmonary atherosclerosis (I27.0)

Source: I70 (category, inherited).

Instructional note

code, if applicable, to identify chronic total occlusion of artery of extremity (I70.92)

Source: I70.5 (self, inherited).

Includes

any condition classifiable to I70.518, I70.528, and I70.538

Source: I70.55 (self, direct).

Instructional note

code to identify severity of ulcer (L98.49)

Source: I70.55 (self, direct).

Source: CMS FY2027 Tabular List and Alphabetic Index.

Open Tabular instructions and code details

Compare the FY2027 additions, removals and billable-status changes

What does I70.55 mean in FY2027?

The official ICD-10-CM descriptor is Atherosclerosis of nonautologous biological bypass graft(s) of other extremity with ulceration. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.

Is I70.55 billable in FY2027?

The FY2027 order file marks I70.55 as billable. Check the complete Tabular instructions and documentation before assigning it.

Does I70.55 map to an HCC?

In the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service), I70.55 maps to CMS-HCC V28 HCC 263 (Atherosclerosis of Arteries of the Extremities with Ulceration or Gangrene) and HCC 383 (Chronic Ulcer of Skin, Except Pressure, Not Specified as Through to Bone or Muscle). This code has a CMS age requirement: applies when age >= 15. For 2027 dates of service, CMS has not yet published the payment year 2028 mappings. Under the PY2026 CMS mapping; CMS 2027 initial file unchanged: ESRD HCC 106 and HCC 161 (This code has a CMS age requirement: applies when age >= 15); RxHCC HCC 311 (This code has a CMS age requirement: applies when age >= 15). Coefficients for these models are pending verification for payment year 2027. HHS-HCC: HCC 153 and HCC 217 (This code has a CMS age requirement: applies when age >= 15) under the HHS-HCC 2026 benefit year mapping (no RAF; HHS-HCC weights vary by metal level). CMS-HCC V24: not used for payment year 2027 Medicare Advantage payment (CMS CY 2027 Rate Announcement). The PACE mapping is still pending verification for FY2027.

Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.

Review the FY2026 April edition