ICD-10 E34.00
Billable / Specific HCC v28: 12 CCCarcinoid syndrome, unspecified
About ICD-10-CM E34.00
ICD-10-CM code E34.00 represents Carcinoid syndrome, unspecified. This is a billable/specific code in the Endocrine, Nutritional, and Metabolic chapter (block E34). The 2026 edition of ICD-10-CM E34.00 became effective on October 1, 2025.
Coding Tips for E34.00
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
E34.00 is a CMS-HCC v28 risk-adjustment code (category 12). 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.
E34.00 is designated CC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-CC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag CC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under E34.00. Per CMS ICD-10-CM Tabular 2026.
- Carcinoid disease, unspecified
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.
Inpatient DRG Impact, CC
codes Carcinoid syndrome, unspecified. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for E34.00
Local Coverage Determinations (LCDs) from CMS MACs that list E34.00 as a covered diagnosis.
Showing top 10 of 83 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing E34.00.
3 Cigna
5 Medicare
3 Aetna
CPT Codes Commonly Billed with E34.00
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 88120 CMS LCD: Billing and Coding: Lab: Bladder/Urothelial Tumor Markers CMS LCD
- 86386 CMS LCD: Billing and Coding: Lab: Bladder/Urothelial Tumor Markers CMS LCD
- 86294 CMS LCD: Billing and Coding: Lab: Bladder/Urothelial Tumor Markers CMS LCD
- 86316 CMS LCD: Billing and Coding: Lab: Bladder/Urothelial Tumor Markers CMS LCD
- 88121 CMS LCD: Billing and Coding: Lab: Bladder/Urothelial Tumor Markers CMS LCD
- J2353 CMS LCD: Billing and Coding: Octreotide Acetate for Injectable Suspension (Sandostatin� LAR Depot) CMS LCD
Codes Adjacent To E34.00
Other codes in section E20-E35 (Disorders of other endocrine glands).
ICD-10 E34.00, Billing FAQ
Is ICD-10 code E34.00 billable? +
Yes, E34.00 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to E34.00? +
ICD-10 E34.00 includes: Carcinoid disease, unspecified.
Does E34.00 affect Medicare Advantage HCC risk adjustment? +
Yes. E34.00 maps to CMS-HCC v28 category 12. Capture this diagnosis annually for accurate Medicare Advantage risk score.
Is E34.00 a CC or MCC for inpatient DRG? +
Yes, this code is designated as CC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What CPT codes are commonly billed with E34.00? +
Procedures frequently paired with E34.00 include: 88120, 86386, 86294, 86316, 88121.
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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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