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ICD-10-CM 2027 diagnosis code

I80.249Phlebitis and thrombophlebitis of unspecified peroneal vein

✓ Billable / specificCC — complication/comorbidityUnspecified — edit

I80.249 is a valid, billable ICD-10-CM code for phlebitis and thrombophlebitis of unspecified peroneal vein. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2020 (effective October 1, 2019). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I80.249

I80.249 is the ICD-10-CM diagnosis code for phlebitis and thrombophlebitis of unspecified peroneal vein. It belongs to category I80 (phlebitis and thrombophlebitis), block I80-I89 (diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified) 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 I80.24, choose I80.249 (unspecified peroneal vein) only when documentation doesn't support a more specific option: right peroneal vein (I80.241), left peroneal vein (I80.242) and bilateral (I80.243).

Code first: , if applicable: phlebitis and thrombophlebitis complicating abortion, ectopic or molar pregnancy (O00-O07, O08.7) and phlebitis and thrombophlebitis complicating pregnancy, childbirth and the puerperium (O22.-, O87.-).

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 is an unspecified code for which a more specific option (often laterality) exists, and the Medicare Code Editor flags it for review on inpatient claims.

It was added in FY2020, effective October 1, 2019.

Notes that apply from higher levels

Instructions written at a parent level also apply to I80.249.

› From I80 Phlebitis and thrombophlebitis
Includes
  • endophlebitis
  • inflammation, vein
  • periphlebitis
  • suppurative phlebitis
Excludes1
Code first
  • , if applicable: phlebitis and thrombophlebitis complicating abortion, ectopic or molar pregnancy (O00-O07, O08.7)
  • phlebitis and thrombophlebitis complicating pregnancy, childbirth and the puerperium (O22.-, O87.-)

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

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

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
  • FY2020 (effective 10/1/2019): Added
  • No changes since FY2020.

Common questions about I80.249

Is I80.249 billable?

Yes. I80.249 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I80.249 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I80.249 as a principal diagnosis.

Is I80.249 a CC or MCC?

I80.249 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does I80.249 group to?

I80.249 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.