ICD-10-CM 2027
ICD-10 code for Lentivirus
Lentivirus as the cause of diseases classified elsewhere
From the official ICD-10-CM alphabetic index entry “Lentivirus, as cause of disease classified elsewhere”. Page updated September 29, 2026.
About coding Lentivirus
The ICD-10-CM code for Lentivirus is B97.31 (Lentivirus as the cause of diseases classified elsewhere).
Within B97.3 (retrovirus as the cause of diseases classified elsewhere), B97.31 is specifically for Lentivirus as the cause of diseases classified elsewhere. Related codes cover unspecified retrovirus as the cause of diseases classified elsewhere (B97.30), Oncovirus as the cause of diseases classified elsewhere (B97.32), human T-cell lymphotrophic virus, type I [HTLV-I] as the cause of diseases classified elsewhere (B97.33), human T-cell lymphotrophic virus, type II [HTLV-II] as the cause of diseases classified elsewhere (B97.34), human immunodeficiency virus, type 2 [HIV 2] as the cause of diseases classified elsewhere (B97.35) and other retrovirus as the cause of diseases classified elsewhere (B97.39).
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 865 (Viral Illness with MCC, relative weight 1.3485) and DRG 866 (Viral Illness without MCC, relative weight 0.8692), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), 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 Lentivirus ICD-10 codes
What is the ICD-10 code for Lentivirus?
- B97.31 — Lentivirus as the cause of diseases classified elsewhere.
Is B97.31 billable?
- Yes. B97.31 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B97.31 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is B97.31 a CC or MCC?
- No. B97.31 is neither a CC nor an MCC under MS-DRG v44.0.