ICD-10 D89.44
Billable / Specific HCC v28: 47Hereditary alpha tryptasemia
About ICD-10-CM D89.44
ICD-10-CM code D89.44 represents Hereditary alpha tryptasemia. This is a billable/specific code in the Blood and Blood-forming Organs chapter (block D89). The 2026 edition of ICD-10-CM D89.44 became effective on October 1, 2025.
Coding Tips for D89.44
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
D89.44 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.
Use Additional Code
When coding D89.44, also report these additional codes when applicable.
- code, if applicable, for:
- allergy status, other than to drugs and biological substances (Z91.0-)
- personal history of anaphylaxis (Z87.892)
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 D89.44
Local Coverage Determinations (LCDs) from CMS MACs that list D89.44 as a covered diagnosis.
Showing top 10 of 537 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing D89.44.
1 Aetna
4 Medicare
CPT Codes Commonly Billed with D89.44
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Codes Adjacent To D89.44
Other codes in section D80-D89 (Certain disorders involving the immune mechanism).
ICD-10 D89.44, Billing FAQ
Is ICD-10 code D89.44 billable? +
Yes, D89.44 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
Does D89.44 affect Medicare Advantage HCC risk adjustment? +
Yes. D89.44 maps to CMS-HCC v28 category 47. Capture this diagnosis annually for accurate Medicare Advantage risk score.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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