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ICD-10-CM 2027 diagnosis code

D75.838Other thrombocytosis

✓ Billable / specific

D75.838 is a valid, billable ICD-10-CM code for other thrombocytosis. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2022 (effective October 1, 2021). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About D75.838

D75.838 is the ICD-10-CM diagnosis code for other thrombocytosis. It belongs to category D75 (other and unspecified diseases of blood and blood-forming organs), block D70-D77 (other disorders of blood and blood-forming organs) and chapter 3 (diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

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.

It was added in FY2022, effective October 1, 2021.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Reactive thrombocytosis
  • Secondary thrombocytosis
Code alsoTwo codes may be needed; sequencing depends on circumstances
  • underlying condition, if known and applicable

Notes that apply from higher levels

Instructions written at a parent level also apply to D75.838.

› From D75.83 Thrombocytosis
Excludes2
  • essential thrombocythemia (D47.3)
› From D75 Other and unspecified diseases of blood and blood-forming organs
Excludes2
  • acute lymphadenitis (L04.-)
  • chronic lymphadenitis (I88.1)
  • enlarged lymph nodes (R59.-)
  • hypergammaglobulinemia NOS (D89.2)
  • lymphadenitis NOS (I88.9)
  • mesenteric lymphadenitis (acute) (chronic) (I88.0)

Broader instructions also apply from Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism.

Alphabetic index entries

3 entries

Terms in the official ICD-10-CM index that lead to D75.838.

Codes whose notes reference D75.838

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2022 (effective 10/1/2021): Added
  • No changes since FY2022.

Common questions about D75.838

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.

What DRG does D75.838 group to?

D75.838 is used in the MS-DRG v44.0 logic for MS-DRG 814 (Reticuloendothelial and Immunity Disorders with MCC), MS-DRG 815 (Reticuloendothelial and Immunity Disorders with CC) and MS-DRG 816 (Reticuloendothelial and Immunity Disorders without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.