ICD-10-CM 2027 diagnosis code
I70.549Atherosclerosis of nonautologous biological bypass graft(s) of the left leg with ulceration of unspecified site
I70.549 is a valid, billable ICD-10-CM code for atherosclerosis of nonautologous biological bypass graft(s) of the left leg with ulceration of unspecified site. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Athscl nonaut bio bypass of left leg w ulcer of unsp site
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About I70.549
I70.549 is the ICD-10-CM diagnosis code for atherosclerosis of nonautologous biological bypass graft(s) of the left leg with ulceration of unspecified site. It belongs to category I70 (atherosclerosis), block I70-I79 (diseases of arteries, arterioles and capillaries) and chapter 9 (diseases of the circulatory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within I70.54, choose I70.549 (of unspecified site) only when documentation doesn't support a more specific option: of thigh (I70.541), of calf (I70.542), of ankle (I70.543), of heel and midfoot (I70.544), of other part of foot (I70.545) and of other part of lower leg (I70.548).
Use an additional code to identify: exposure to environmental tobacco smoke (Z77.22), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31), tobacco dependence (F17.-) and tobacco use (Z72.0).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 299 (Peripheral Vascular Disorders with MCC, relative weight 1.5842), DRG 300 (Peripheral Vascular Disorders with CC, relative weight 1.0464) and DRG 301 (Peripheral Vascular Disorders without CC/MCC, relative weight 0.7133), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
The Medicare Code Editor expects this diagnosis only for patients age 15 through 124.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 440.32 (atherosclerosis of nonautologous biological bypass graft of the extremities) and 707.19 (ulcer of other part of lower limb).
Notes that apply from higher levels
Instructions written at a parent level also apply to I70.549.
› From I70.54 Atherosclerosis of nonautologous biological bypass graft(s) of the left leg with ulceration
- code to identify severity of ulcer (L97.-)
› From I70.5 Atherosclerosis of nonautologous biological bypass graft(s) of the extremities
- code, if applicable, to identify chronic total occlusion of artery of extremity (I70.92)
› From I70 Atherosclerosis
- arteriolosclerosis
- arterial degeneration
- arteriosclerosis
- arteriosclerotic vascular disease
- arteriovascular degeneration
- atheroma
- endarteritis deformans or obliterans
- senile arteritis
- senile endarteritis
- vascular degeneration
Broader instructions also apply from Chapter 9: Diseases of the circulatory system.
Alphabetic index entries
2 entriesTerms in the official ICD-10-CM index that lead to I70.549.
- Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification) › with › critical limb ischemia › bypass graft › nonautologous biological graft › leg › left › with › ulceration (and intermittent claudication and rest pain)
- Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification) › extremities (native arteries) › bypass graft › nonautologous biological graft › leg › left › with › ulceration (and intermittent claudication and rest pain)
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 05 · Diseases and Disorders of the Circulatory System
ICD-9-CM equivalent
Converter →- 440.32Atherosclerosis of nonautologous biological bypass graft of the extremitiesapproximate, combination
- 707.19Ulcer of other part of lower limbapproximate, combination
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about I70.549
Is I70.549 billable?
- Yes. I70.549 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I70.549 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I70.549 as a principal diagnosis.
Is I70.549 a CC or MCC?
- I70.549 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does I70.549 group to?
- I70.549 is used in the MS-DRG v44.0 logic for MS-DRG 299 (Peripheral Vascular Disorders with MCC), MS-DRG 300 (Peripheral Vascular Disorders with CC) and MS-DRG 301 (Peripheral Vascular Disorders without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for I70.549?
- The CMS General Equivalence Mappings map I70.549 to ICD-9-CM 440.32 and 707.19.