ICD-10-CM 2027
ICD-10 code for Oestrus ovis infestation
From the official ICD-10-CM alphabetic index entry “Infestation › Oestrus ovis”. Page updated September 29, 2026.
About coding Oestrus ovis infestation
The ICD-10-CM code for Oestrus ovis infestation is B87.9 (Myiasis, unspecified).
Within B87, choose B87.9 (unspecified) only when documentation doesn't support a more specific option: cutaneous myiasis (B87.0), wound myiasis (B87.1), ocular myiasis (B87.2), nasopharyngeal myiasis (B87.3), Aural myiasis (B87.4) and of other sites (B87.8).
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 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), 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 Oestrus ovis infestation ICD-10 codes
What is the ICD-10 code for Oestrus ovis infestation?
- B87.9 — Myiasis, unspecified.
Is B87.9 billable?
- Yes. B87.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B87.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B87.9 as a principal diagnosis.
Is B87.9 a CC or MCC?
- No. B87.9 is neither a CC nor an MCC under MS-DRG v44.0.