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ICD-10-CM 2027 diagnosis code

I74.9Embolism and thrombosis of unspecified artery

✓ Billable / specificCC — complication/comorbidity

I74.9 is a valid, billable ICD-10-CM code for embolism and thrombosis of unspecified artery. 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 Embolism, ICD-10 code for Artery embolism.

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 I74.9

I74.9 is the ICD-10-CM diagnosis code for embolism and thrombosis of unspecified artery. It belongs to category I74 (arterial embolism and thrombosis), 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 I74, choose I74.9 (unspecified artery) only when documentation doesn't support a more specific option: abdominal aorta (I74.0), other and unspecified parts of aorta (I74.1), arteries of the upper extremities (I74.2), arteries of the lower extremities (I74.3), arteries of extremities, unspecified (I74.4), iliac artery (I74.5) and other arteries (I74.8).

Code first: embolism and thrombosis complicating abortion or ectopic or molar pregnancy (O00-O07, O08.2) and embolism and thrombosis complicating pregnancy, childbirth and the puerperium (O88.-).

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), DRG 301 (Peripheral Vascular Disorders without CC/MCC, relative weight 0.7133), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 05 (Diseases and Disorders of the Circulatory System) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), 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 444.9 (embolism and thrombosis of unspecified artery).

Notes that apply from higher levels

Instructions written at a parent level also apply to I74.9.

› From I74 Arterial embolism and thrombosis
Includes
  • embolic infarction
  • embolic occlusion
  • thrombotic infarction
  • thrombotic occlusion
Excludes2
  • atheroembolism (I75.-)
  • basilar embolism and thrombosis (I63.0-I63.2, I65.1)
  • carotid embolism and thrombosis (I63.0-I63.2, I65.2)
  • cerebral embolism and thrombosis (I63.3-I63.5, I66.-)
  • coronary embolism and thrombosis (I21-I25)
  • mesenteric embolism and thrombosis (K55.0-)
  • ophthalmic embolism and thrombosis (H34.-)
  • precerebral embolism and thrombosis NOS (I63.0-I63.2, I65.9)
  • pulmonary embolism and thrombosis (I26.-)
  • renal embolism and thrombosis (N28.0)
  • retinal embolism and thrombosis (H34.-)
  • septic embolism and thrombosis (I76)
  • vertebral embolism and thrombosis (I63.0-I63.2, I65.0)
Code first
  • embolism and thrombosis complicating abortion or ectopic or molar pregnancy (O00-O07, O08.2)
  • embolism and thrombosis complicating pregnancy, childbirth and the puerperium (O88.-)

Broader instructions also apply from Chapter 9: Diseases of the circulatory system.

Alphabetic index entries

4 entries

Terms in the official ICD-10-CM index that lead to I74.9.

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 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

ICD-9-CM equivalent

Converter →
  • 444.9Embolism and thrombosis of unspecified arteryexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about I74.9

Is I74.9 billable?

Yes. I74.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I74.9 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I74.9 as a principal diagnosis.

Is I74.9 a CC or MCC?

I74.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does I74.9 group to?

I74.9 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), MS-DRG 301 (Peripheral Vascular Disorders without CC/MCC), MS-DRG 791 (Prematurity with Major Problems) and MS-DRG 793 (Full Term Neonate with Major Problems). 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 I74.9?

The CMS General Equivalence Mappings map I74.9 to ICD-9-CM 444.9.