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ICD-10-CM 2027 diagnosis code

I87.033Postthrombotic syndrome with ulcer and inflammation of bilateral lower extremity

✓ Billable / specificCC — complication/comorbidity

I87.033 is a valid, billable ICD-10-CM code for postthrombotic syndrome with ulcer and inflammation of bilateral lower extremity. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Postthrom syndrome w ulcer and inflam of bilateral low extrm

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 I87.033

I87.033 is the ICD-10-CM diagnosis code for Postthrombotic syndrome with ulcer and inflammation of bilateral lower extremity. It belongs to category I87 (other disorders of veins), 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 I87.03 (Postthrombotic syndrome with ulcer and inflammation), I87.033 is specifically for Postthrombotic syndrome with ulcer and inflammation of bilateral lower extremity. Related codes cover of right lower extremity (I87.031), of left lower extremity (I87.032) and of unspecified lower extremity (I87.039).

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) 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 459.13 (Postphlebetic syndrome with ulcer and inflammation).

Notes that apply from higher levels

Instructions written at a parent level also apply to I87.033.

› From I87.03 Postthrombotic syndrome with ulcer and inflammation
Use additional code
  • code to specify site and severity of ulcer (L97.-)
› From I87.0 Postthrombotic syndrome
Excludes1
  • chronic venous hypertension without deep vein thrombosis (I87.3-)

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.

ICD-9-CM equivalent

Converter →
  • 459.13Postphlebetic syndrome with ulcer and inflammationapproximate

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 I87.033

Is I87.033 billable?

Yes. I87.033 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I87.033 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I87.033 as a principal diagnosis.

Is I87.033 a CC or MCC?

I87.033 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does I87.033 group to?

I87.033 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 I87.033?

The CMS General Equivalence Mappings map I87.033 to ICD-9-CM 459.13.