ICD-10 D89.89
Billable / Specific HCC v28: 47Other specified disorders involving the immune mechanism, not elsewhere classified
About ICD-10-CM D89.89
ICD-10-CM code D89.89 represents Other specified disorders involving the immune mechanism, not elsewhere classified. This is a billable/specific code in the Blood and Blood-forming Organs chapter (block D89). The 2026 edition of ICD-10-CM D89.89 became effective on October 1, 2025.
Coding Tips for D89.89
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
D89.89 is a CMS-HCC v28 risk-adjustment code (category 47). To count for the patient Risk Adjustment Factor (RAF), document the diagnosis with MEAT language each calendar year: Monitored, Evaluated, Assessed, Treated. A diagnosis on the problem list alone does not satisfy CMS RADV audit standards. Include the diagnosis in the assessment with current status and current treatment plan.
Type 1 Excludes
Pure excludes, these codes can never be coded together with D89.89. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- human immunodeficiency virus disease (B20)
Medicare Advantage HCC Impact
Capture this diagnosis annually for accurate risk adjustment. Missed HCC captures are the #1 revenue leak in Medicare Advantage risk programs.
Medicare LCD Coverage for D89.89
Local Coverage Determinations (LCDs) from CMS MACs that list D89.89 as a covered diagnosis.
Showing top 10 of 694 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing D89.89.
5 Medicare
1 Aetna
CPT Codes Commonly Billed with D89.89
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 87507 CMS LCD: Billing and Coding: Gastrointestinal Pathogen (GIP) Panels Utilizing Multiplex Nucleic Acid Amplification Techniques (NAATs) CMS LCD
- 87505 CMS LCD: Billing and Coding: Gastrointestinal Pathogen (GIP) Panels Utilizing Multiplex Nucleic Acid Amplification Techniques (NAATs) CMS LCD
- 87506 CMS LCD: Billing and Coding: Gastrointestinal Pathogen (GIP) Panels Utilizing Multiplex Nucleic Acid Amplification Techniques (NAATs) CMS LCD
- 87812 CMS LCD: Billing and Coding: Respiratory Pathogen Panel Testing CMS LCD
- 87428 CMS LCD: Billing and Coding: Respiratory Pathogen Panel Testing CMS LCD
- 87913 CMS LCD: Billing and Coding: Respiratory Pathogen Panel Testing CMS LCD
Convert D89.89 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| D89.89 | 2798 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To D89.89
Other codes in section D80-D89 (Certain disorders involving the immune mechanism).
ICD-10 D89.89, Billing FAQ
Is ICD-10 code D89.89 billable? +
Yes, D89.89 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What codes are Type 1 Excludes for D89.89? +
Type 1 Excludes (never code together with D89.89): human immunodeficiency virus disease (B20)
Does D89.89 affect Medicare Advantage HCC risk adjustment? +
Yes. D89.89 maps to CMS-HCC v28 category 47. Capture this diagnosis annually for accurate Medicare Advantage risk score.
What CPT codes are commonly billed with D89.89? +
Procedures frequently paired with D89.89 include: 87507, 87505, 87506, 87812, 87428.
What ICD-9 codes does D89.89 map to? +
Per CMS GEMs, D89.89 maps to ICD-9 codes: 2798. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
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