B59 – Pneumocystosis
ICD-10-CM 2027 diagnosis code · Protozoal diseases
ICD-10-CM code
B59
- Code
B59(claims format:B59)- Description
- Pneumocystosis
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 1. Certain infectious and parasitic diseases (A00-B99)
- Block
- B50-B64 Protozoal diseases
Notes for B59
Applicable to:
- Pneumonia due to Pneumocystis carinii
- Pneumonia due to Pneumocystis jirovecii
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block B50-B64
Index terms for B59
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Pneumocystosis
- Pneumocystis jirovecii
- Pneumonia, plasma cell
- Pneumonia, Pneumocystis
- Pneumonia, in, pneumocystosis
- Pneumocystis carinii pneumonia
- Pneumonia, interstitial, plasma cell
- Disease, diseased, protozoal, pneumocystosis
- Infection, infected, infective, Pneumocystis carinii
- Infection, infected, infective, Pneumocystis jirovecii
Frequently asked questions
What is ICD-10 code B59?
B59 is the ICD-10-CM code for pneumocystosis, in the block B50-B64 (Protozoal diseases).
Is B59 a billable code?
Yes. B59 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.