2027 ICD-10-CM Diagnosis Code I77.1Stricture of artery
ICD-10-CM Codes›I00–I99›I70-I79›I77
- Billable — Valid for Submission
- Chronic Condition
I77.1 is a billable ICD-10-CM diagnosis code for stricture of artery. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 299 through 301. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified circulatory disease.
I77.1 no longer risk-adjusts for Medicare Advantage: it mapped to HCC 108 under the retired CMS-HCC V24 model through payment year 2025 but maps to no category in the live V28 model. It still risk-adjusts in the PACE (CMS-HCC V22) category 108, ESRD (V21) category 108, and ESRD (V24) category 108 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
I77.1 no longer risk-adjusts for Medicare Advantage: it maps to no payment category in the live CMS-HCC V28 model, although it still risk-adjusts in the other CMS models shown below.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acquired stenosis of common arterial trunk following procedure
- Acquired tortuosity of branch of aortic arch
- Arterial insufficiency
- Arterial thoracic outlet syndrome
- Arterial thoracic outlet syndrome of left subclavian artery
- Arterial thoracic outlet syndrome of right subclavian artery
- Asymptomatic stenosis of extracranial artery
- Common iliac artery stenosis
- Compression of transplanted artery
- Dermatosis resulting from arterial insufficiency
- External iliac artery endofibrosis
- External iliac artery stenosis
- Extrinsic compression of artery
- Gangrene due to arterial insufficiency
- Hepatic artery stenosis
- Kinking of transplanted artery
- Left external iliac artery stenosis
- Left iliac artery stenosis
- Left thoracic outlet syndrome
- Occlusion of distal artery of left upper limb
- Occlusion of distal artery of right upper limb
- Occlusion of left popliteal artery
- Occlusion of right popliteal artery
- Popliteal artery occlusion
- Recoarctation of aorta following procedure
- Recoarctation of aorta following surgical repair of congenital coarctation of aorta
- Right external iliac artery stenosis
- Right iliac artery stenosis
- Right thoracic outlet syndrome
- Stenosis of abdominal aorta
- Stenosis of artery
- Stenosis of brachiocephalic artery
- Stenosis of iliac artery
- Stenosis of retinal artery
- Stenosis of thoracic aorta
- Stenosis of transplant artery
- Stricture of aorta
- Stricture of artery
- Tortuosity of branch of aortic arch
- Tortuosity of systemic artery
- Tortuous coronary artery
- Vascular thoracic outlet syndrome
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I77.1: its own notes plus those printed at I77 and Chapter 9. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Narrowing of artery
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
artery I77.1
Disease, diseased See Also: Syndrome;
arterial See Also: Disease, artery; I77.9
occlusive See Also: Occlusion, by site;
obliterative vascular I77.1
obliterative I77.1
artery I77.1
artery I77.1
disease, arteriolar I77.1
Stenosis, stenotic (cicatricial) See Also: Stricture;
artery NEC See Also: Arteriosclerosis; I77.1
aorta, acquired I77.1
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Stricture of Artery
a pathologic narrowing of an artery.
Convert I77.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I77.1Overview
What is the ICD-10 code for stricture of artery?
The ICD-10-CM code for stricture of artery is I77.1 (sometimes written as I771). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is I77.1 (Other disorders of arteries and arterioles) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report stricture of artery on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I77.1 group to?
When stricture of artery is the principal diagnosis on an inpatient stay, it groups to MS-DRG 301, 300, 299, with relative weights from 0.7132 to 1.5840 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of I77.1?
Under the General Equivalence Mappings, stricture of artery converts to ICD-9-CM 447.1 (stricture of artery). The mapping is a direct match.
Does I77.1 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage. I77.1 mapped to HCC 108 in the retired CMS-HCC V24 model, which last determined payment in 2025, but it maps to no category in the live V28 model; see all codes that no longer risk-adjust. It still risk-adjusts in the PACE (CMS-HCC V22) category 108 (Vascular Disease), ESRD (V21) category 108 (Vascular Disease), and ESRD (V24) category 108 (Vascular Disease).
