ICD-10-CM 2027
ICD-10 code for Erythermalgia
From the official ICD-10-CM alphabetic index entry “Erythermalgia (primary)”. Page updated September 29, 2026.
About coding Erythermalgia
The ICD-10-CM code for Erythermalgia is I73.81 (Erythromelalgia).
Within I73.8 (other specified peripheral vascular diseases), I73.81 is specifically for Erythromelalgia. Related codes cover other specified peripheral vascular diseases (I73.89).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
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.
Common questions about Erythermalgia ICD-10 codes
What is the ICD-10 code for Erythermalgia?
- I73.81 — Erythromelalgia.
Is I73.81 billable?
- Yes. I73.81 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I73.81 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I73.81 as a principal diagnosis.
Is I73.81 a CC or MCC?
- No. I73.81 is neither a CC nor an MCC under MS-DRG v44.0.