D75.829 ICD-10-CM Code: Heparin-induced thrombocytopenia, unspecified
D75.829 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software
HCC Buddy Code Card
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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)
D75.829
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceHeparin-induced thrombocytopenia, unspecified
A drop in platelet count caused by heparin medication when the specific type or mechanism is not specified or documented.
Buddy Insight
Heparin-induced thrombocytopenia, unspecified, indicates a documented drop in platelet count caused by heparin exposure where the provider has not specified whether it is immune-mediated (type II) or non-immune (type I).
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 075
Code-level coefficient reference
ESRD/PACE
MappedHCC 48
Code-level coefficient reference
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for D75.829. Check the code and parent instructions in the Code Book.
Excludes 2
Official- autoimmune disease (systemic) NOS (M35.9)Inherited from D50-D89, D75
- certain conditions originating in the perinatal period (P00-P96)Inherited from D50-D89, D75
- complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from D50-D89, D75
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)Inherited from D50-D89, D75
- endocrine, nutritional and metabolic diseases (E00-E88)Inherited from D50-D89, D75
- human immunodeficiency virus [HIV] disease (B20)Inherited from D50-D89, D75
- injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from D50-D89, D75
- neoplasms (C00-D49)Inherited from D50-D89, D75
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from D50-D89, D75
- acute lymphadenitis (L04.-)Inherited from D50-D89, D75
- chronic lymphadenitis (I88.1)Inherited from D50-D89, D75
- enlarged lymph nodes (R59.-)Inherited from D50-D89, D75
- hypergammaglobulinemia NOS (D89.2)Inherited from D50-D89, D75
- lymphadenitis NOS (I88.9)Inherited from D50-D89, D75
- mesenteric lymphadenitis (acute) (chronic) (I88.0)Inherited from D50-D89, D75
Related Codes
Includes
OfficialNo Includes notes are included in this display for D75.829. Check the code and parent instructions in the Code Book.
Excludes 1
OfficialNo Excludes 1 notes are included in this display for D75.829. Check the code and parent instructions in the Code Book.
Code First
OfficialNo Code First sequencing instructions are included in this display for D75.829. Check the code and parent instructions in the Code Book.
Use Additional
Official- code, if applicable, for adverse effect of heparin (T45.515-)Inherited from D75.82
Code Also
OfficialNo Code Also instructions are included in this display for D75.829. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
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 D75.829 an HCC code?
D75.829 has no mapping under the current CMS-HCC V28 community payment model. D75.829 has a separate mapping under the CMS-HCC ESRD model (HCC 48 (Coagulation Defects and Other Specified Hematological Disorders)); the applicable result needs member context. D75.829 also appears in the HHS-HCC commercial risk model (HCC 075 (HHS-HCC 075 adult, RAF varies by metal level)), which is a commercial market model rather than a Medicare Advantage payment mapping.
- Code
- D75.829
- Description
- Heparin-induced thrombocytopenia, unspecified
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.
Work D75.829 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for D75.829
For D75.829, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Coder workflow notes
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What This Code Means
D75.829 is the ICD-10-CM diagnosis code for heparin-induced thrombocytopenia, unspecified. A drop in platelet count caused by heparin medication when the specific type or mechanism is not specified or documented. D75.829 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).
D75.829 has no mapping under the current CMS-HCC V28 community payment model. D75.829 has a separate mapping under the CMS-HCC ESRD model (HCC 48 (Coagulation Defects and Other Specified Hematological Disorders)); the applicable result needs member context. D75.829 also appears in the HHS-HCC commercial risk model (HCC 075 (HHS-HCC 075 adult, RAF varies by metal level)), which is a commercial market model rather than a Medicare Advantage payment mapping. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.
This is a default code; attempt to determine immune vs. non-immune status from clinical documentation before using this unspecified code.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for D75.829 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a default code; attempt to determine immune vs. non-immune status from clinical documentation before using this unspecified code
- •Query the provider if the type of HIT is not clearly documented
Clinical Significance
Heparin-induced thrombocytopenia, unspecified, indicates a documented drop in platelet count caused by heparin exposure where the provider has not specified whether it is immune-mediated (type II) or non-immune (type I). Both types have significantly different clinical implications, with type II carrying life-threatening thrombotic risk.
Documentation Requirements
- ✓Documentation should include the temporal relationship between heparin administration and platelet decline, nadir platelet count, percentage of platelet drop from baseline, and any thrombotic complications.
- ✓Providers should be queried to specify immune vs.
- ✓non-immune type, as this significantly impacts treatment decisions and coding specificity.
- ✓Include anti-PF4 antibody testing results if performed.
Commonly Confused Codes
- •D75.821 (immune-mediated heparin-induced thrombocytopenia, preferred when anti-PF4 antibodies are positive), D75.822 (non-immune heparin-induced thrombocytopenia, preferred for mild transient type I), D75.828 (other specified heparin-induced thrombocytopenia for atypical variants), D69.59 (other secondary thrombocytopenia from non-heparin causes).