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ICD-10-CM 2027 diagnosis code

I80.233Phlebitis and thrombophlebitis of tibial vein, bilateral

✓ Billable / specificCC — complication/comorbidity

I80.233 is a valid, billable ICD-10-CM code for phlebitis and thrombophlebitis of tibial vein, bilateral. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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 I80.233

I80.233 is the ICD-10-CM diagnosis code for phlebitis and thrombophlebitis of tibial vein, bilateral. 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 I80.23 (phlebitis and thrombophlebitis of tibial vein), I80.233 is specifically for phlebitis and thrombophlebitis of tibial vein, bilateral. Related codes cover right tibial vein (I80.231), left tibial vein (I80.232) and unspecified tibial vein (I80.239).

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 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 451.19 (phlebitis and thrombophlebitis of deep veins of lower extremities, other).

Notes that apply from higher levels

Instructions written at a parent level also apply to I80.233.

› 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

ICD-9-CM equivalent

Converter →
  • 451.19Phlebitis and thrombophlebitis of deep veins of lower extremities, otherapproximate

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 I80.233

Is I80.233 billable?

Yes. I80.233 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I80.233 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I80.233 as a principal diagnosis.

Is I80.233 a CC or MCC?

I80.233 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does I80.233 group to?

I80.233 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 I80.233?

The CMS General Equivalence Mappings map I80.233 to ICD-9-CM 451.19.