D75.839 ICD-10-CM Code: Thrombocytosis, unspecified
D75.839 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · free HCC coding tools
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FY 2026 Apr update / Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89) / Other disorders of blood and blood-forming organs (D70-D77)
D75.839
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceThrombocytosis, unspecified
An abnormally high platelet count in the blood when the underlying cause is not specified or identified.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Thrombocythemia NOS
- Thrombocytosis NOS
Excludes 2
Official- autoimmune disease (systemic) NOS (M35.9)Inherited from D50-D89, D75, D75.83
- certain conditions originating in the perinatal period (P00-P96)Inherited from D50-D89, D75, D75.83
- complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from D50-D89, D75, D75.83
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)Inherited from D50-D89, D75, D75.83
- endocrine, nutritional and metabolic diseases (E00-E88)Inherited from D50-D89, D75, D75.83
- human immunodeficiency virus [HIV] disease (B20)Inherited from D50-D89, D75, D75.83
- injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from D50-D89, D75, D75.83
- neoplasms (C00-D49)Inherited from D50-D89, D75, D75.83
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from D50-D89, D75, D75.83
- acute lymphadenitis (L04.-)Inherited from D50-D89, D75, D75.83
- chronic lymphadenitis (I88.1)Inherited from D50-D89, D75, D75.83
- enlarged lymph nodes (R59.-)Inherited from D50-D89, D75, D75.83
- hypergammaglobulinemia NOS (D89.2)Inherited from D50-D89, D75, D75.83
- lymphadenitis NOS (I88.9)Inherited from D50-D89, D75, D75.83
- mesenteric lymphadenitis (acute) (chronic) (I88.0)Inherited from D50-D89, D75, D75.83
- essential thrombocythemia (D47.3)Inherited from D50-D89, D75, D75.83
Related Codes
Includes
OfficialNo Includes notes are included in this display for D75.839. Check the code and parent instructions in the Code Book.
Excludes 1
OfficialNo Excludes 1 notes are included in this display for D75.839. Check the code and parent instructions in the Code Book.
Code First
OfficialNo Code First sequencing instructions are included in this display for D75.839. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for D75.839. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for D75.839. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is D75.839 an HCC code?
No. D75.839 is a billable ICD-10-CM code with no mapping under the current CMS-HCC V28 community payment model, and none under the ESRD, Part D RxHCC, or HHS-HCC models.
- Code
- D75.839
- Description
- Thrombocytosis, unspecified
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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What This Code Means
D75.839 is the ICD-10-CM diagnosis code for thrombocytosis, unspecified. An abnormally high platelet count in the blood when the underlying cause is not specified or identified. D75.839 sits in the ICD-10-CM chapter for diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (d50-d89), within the section covering other disorders of blood and blood-forming organs (d70-d77).
D75.839 is a billable ICD-10-CM code, but no current CMS-HCC V28 community payment mapping is shown, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.
Investigate the medical record for secondary causes of thrombocytosis (inflammation, malignancy, iron deficiency) before coding as unspecified.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for D75.839 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Investigate the medical record for secondary causes of thrombocytosis (inflammation, malignancy, iron deficiency) before coding as unspecified
- •Query the provider if the etiology of elevated platelets is not documented