ICD-10-CM 2027
ICD-10 code for secondary thrombocytosis
From the official ICD-10-CM alphabetic index entry “Thrombocytosis › secondary”. Page updated September 29, 2026.
About coding secondary thrombocytosis
The ICD-10-CM code for secondary thrombocytosis is D75.838 (Other thrombocytosis).
Within D75.83, choose D75.838 (Other thrombocytosis) only when documentation doesn't support a more specific option: unspecified (D75.839).
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 814 (Reticuloendothelial and Immunity Disorders with MCC, relative weight 2.0729), DRG 815 (Reticuloendothelial and Immunity Disorders with CC, relative weight 1.0444) and DRG 816 (Reticuloendothelial and Immunity Disorders without CC/MCC, relative weight 0.7381), in MDC 16 (Diseases and Disorders of the Blood and Blood Forming Organs and Immunological Disorders), 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 secondary thrombocytosis ICD-10 codes
What is the ICD-10 code for secondary thrombocytosis?
- D75.838 — Other thrombocytosis.
Is D75.838 billable?
- Yes. D75.838 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can D75.838 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict D75.838 as a principal diagnosis.
Is D75.838 a CC or MCC?
- No. D75.838 is neither a CC nor an MCC under MS-DRG v44.0.