ICD-10 E23.3
Billable / Specific HCC v28: 23Hypothalamic dysfunction, not elsewhere classified
About ICD-10-CM E23.3
ICD-10-CM code E23.3 represents Hypothalamic dysfunction, not elsewhere classified. This is a billable/specific code in the Endocrine, Nutritional, and Metabolic chapter (block E23). The 2026 edition of ICD-10-CM E23.3 became effective on October 1, 2025.
Coding Tips for E23.3
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
E23.3 is a CMS-HCC v28 risk-adjustment code (category 23). 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 E23.3. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- Prader-Willi syndrome (Q87.11)
- Russell-Silver syndrome (Q87.19)
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 E23.3
Local Coverage Determinations (LCDs) from CMS MACs that list E23.3 as a covered diagnosis.
Showing top 10 of 109 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing E23.3.
5 Medicare
CPT Codes Commonly Billed with E23.3
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- J3145 CMS LCD: Billing and Coding: Treatment of Males with Low Testosterone CMS LCD
- 84403 CMS LCD: Billing and Coding: Treatment of Males with Low Testosterone CMS LCD
- 84410 CMS LCD: Billing and Coding: Treatment of Males with Low Testosterone CMS LCD
- J1072 CMS LCD: Billing and Coding: Treatment of Males with Low Testosterone CMS LCD
- 11980 CMS LCD: Billing and Coding: Treatment of Males with Low Testosterone CMS LCD
- J1071 CMS LCD: Billing and Coding: Treatment of Males with Low Testosterone CMS LCD
- J3121 CMS LCD: Billing and Coding: Treatment of Males with Low Testosterone CMS LCD
Convert E23.3 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 |
|---|---|---|
| E23.3 | 2539 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To E23.3
Other codes in section E20-E35 (Disorders of other endocrine glands).
ICD-10 E23.3, Billing FAQ
Is ICD-10 code E23.3 billable? +
Yes, E23.3 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 E23.3? +
Type 1 Excludes (never code together with E23.3): Prader-Willi syndrome (Q87.11); Russell-Silver syndrome (Q87.19)
Does E23.3 affect Medicare Advantage HCC risk adjustment? +
Yes. E23.3 maps to CMS-HCC v28 category 23. Capture this diagnosis annually for accurate Medicare Advantage risk score.
What CPT codes are commonly billed with E23.3? +
Procedures frequently paired with E23.3 include: J3145, 84403, 84410, J1072, 11980.
What ICD-9 codes does E23.3 map to? +
Per CMS GEMs, E23.3 maps to ICD-9 codes: 2539. 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 May 31, 2026.
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