ICD-10-CM 2027
ICD-10 code for chronic thrombosis
Chronic embolism and thrombosis of unspecified vein
From the official ICD-10-CM alphabetic index entry “Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel) › chronic”. Page updated September 29, 2026.
About coding chronic thrombosis
The ICD-10-CM code for chronic thrombosis is I82.91 (Chronic embolism and thrombosis of unspecified vein).
Within I82.9, choose I82.91 (Chronic embolism and thrombosis of unspecified vein) only when documentation doesn't support a more specific option: acute embolism and thrombosis of unspecified vein (I82.90).
Code first venous embolism and thrombosis complicating: abortion, ectopic or molar pregnancy (O00-O07, O08.7) and 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.
Common questions about chronic thrombosis ICD-10 codes
What is the ICD-10 code for chronic thrombosis?
- I82.91 — Chronic embolism and thrombosis of unspecified vein.
Is I82.91 billable?
- Yes. I82.91 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I82.91 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I82.91 as a principal diagnosis.
Is I82.91 a CC or MCC?
- I82.91 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.