ICD-10-CM 2027 diagnosis code
I73.9Peripheral vascular disease, unspecified
I73.9 is a valid, billable ICD-10-CM code for peripheral vascular disease, unspecified. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Peripheral artery disease, ICD-10 code for Vasospasm, ICD-10 code for Angiospasm, ICD-10 code for Arteriospasm.
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 I73.9
I73.9 is the ICD-10-CM diagnosis code for peripheral vascular disease, unspecified. It belongs to category I73 (other peripheral vascular diseases), 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 I73, choose I73.9 (Peripheral vascular disease, unspecified) only when documentation doesn't support a more specific option: Raynaud's syndrome (I73.0), Thromboangiitis obliterans [Buerger's disease] (I73.1) and other specified peripheral vascular diseases (I73.8).
Don't report I73.9 together with the conditions in its Excludes1 note: atherosclerosis of the extremities (I70.2--I70.7-).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
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.
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 443.9 (peripheral vascular disease, unspecified).
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to I73.9.
Broader instructions also apply from Chapter 9: Diseases of the circulatory system.
Alphabetic index entries
40 entriesTerms in the official ICD-10-CM index that lead to I73.9.
- Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor) › cruris
- Angiopathia, angiopathy › peripheral
- Angiospasm (peripheral) (traumatic) (vessel)
- Angiospastic disease or edema
- Arteriospasm
- Change (s) (in) (of) › vasomotor
- Charcot's › syndrome (intermittent claudication)
- Claudication (intermittent)
- Dilatation › vasomotor
- Disease, diseased › angiospastic
- Disease, diseased › arterial › peripheral
- Disease, diseased › artery › peripheral
- Disease, diseased › peripheral › arterial
- Disease, diseased › peripheral › vascular NOS
- Disease, diseased › small vessel
- Disease, diseased › terminal vessel
- Disease, diseased › vascular › obliterative › peripheral
- Disease, diseased › vascular › peripheral (occlusive)
- Disease, diseased › vasomotor
- Disease, diseased › vasospastic
- Disturbance (s) › vasomotor
- Disturbance (s) › vasospastic
- Dysbasia › angiosclerotica intermittens
- Edema, edematous (infectious) (pitting) (toxic) › angiospastic
- Insufficiency, insufficient › arterial › peripheral
- Insufficiency, insufficient › peripheral vascular (arterial)
- Insufficiency, insufficient › vascular › peripheral
- Labile › vasomotor system
- Microangiopathy (peripheral)
- Phenomenon › vasospastic
- Reflex › vasoconstriction
- Spasm (s), spastic, spasticity › artery
- Spasm (s), spastic, spasticity › vascular
- Spasm (s), spastic, spasticity › vasomotor
- Syndrome › Charcot's (angina cruris) (intermittent claudication)
- Syndrome › vasomotor
- Vascular › spasm
- Vasodilation
- Vasospasm (vasoconstriction)
- Vasospasm (vasoconstriction) › peripheral NOS
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 →- 443.9Peripheral vascular disease, unspecifiedexact
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 I73.9
Is I73.9 billable?
- Yes. I73.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I73.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I73.9 as a principal diagnosis.
Is I73.9 a CC or MCC?
- No. I73.9 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does I73.9 group to?
- I73.9 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 I73.9?
- The CMS General Equivalence Mappings map I73.9 to ICD-9-CM 443.9.