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E34.09 ICD-10-CM Code: Other carcinoid syndrome

E34.09 maps to CMS-HCC V28 17 (RAF 4.209). Documentation must support MEAT. MEAT criteria · RAF calculator · free HCC coding tools

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FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Disorders of other endocrine glands (E20-E35)

E34.09

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Other carcinoid syndrome

Carcinoid syndrome with symptoms other than heart involvement, such as flushing, diarrhea, or bronchospasm caused by hormone-secreting tumors.

Buddy the Bee presenting code insight

Buddy Insight

Other carcinoid syndrome captures carcinoid syndrome manifestations that do not involve the heart, such as episodic flushing, secretory diarrhea, bronchospasm, and pellagra-like skin changes.

CMS-HCC V28

HCC 17

RAF 4.209

CMS-HCC V24

HCC 12

RAF 0.150

ACA/HHS

HCC 13

Varies by metal level

ESRD/PACE

HCC 12

RAF 0.045

RXHCC

HCC 22

RAF 0.124

Code Book Path

Official
E34Other endocrine disorders
E34.0Carcinoid syndrome
E34.09Other carcinoid syndrome

Inclusion Terms

Official
  • Carcinoid disease NEC
  • Carcinoid syndrome NEC
  • Other carcinoid disease

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for E34.09 in this effective period.

Related Child Codes

Official
E34.00Carcinoid syndrome, unspecified
E34.01Carcinoid heart syndrome

Includes

Official

ICD-10-CM does not list Includes notes for E34.09 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for E34.09 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for E34.09 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for E34.09 in this effective period.

Code Also

Official
  • the underlying disorder, such as:
  • primary neuroendocrine tumors (C7A.-)
  • secondary neuroendocrine tumors (C7B.-)

Buddy Documentation Tip

HCC Buddy guidance
Documentation should specify the carcinoid manifestations present (flushing episodes with frequency and triggers, diarrhea with stool frequency, bronchospasm severity, skin changes).
Biochemical confirmation through elevated 24-hour urine 5-hydroxyindoleacetic acid or serum chromogranin A should be noted.
The underlying neuroendocrine tumor site and treatment status must be documented.
An echocardiogram documenting absence of cardiac involvement supports use of this code over E34.01.

MEAT Support

HCC Buddy guidance
Documentation should specify the carcinoid manifestations present (flushing episodes with frequency and triggers, diarrhea with stool frequency, bronchospasm severity, skin changes).
Biochemical confirmation through elevated 24-hour urine 5-hydroxyindoleacetic acid or serum chromogranin A should be noted.
The underlying neuroendocrine tumor site and treatment status must be documented.
An echocardiogram documenting absence of cardiac involvement supports use of this code over E34.01.

Audit Caution

HCC Buddy guidance
Always assign the underlying neuroendocrine tumor code (C7A.xxx) in addition to this syndrome code. Do not use this code for flushing or diarrhea without confirmed carcinoid etiology. If cardiac involvement develops later, update to include E34.
Ensure that symptoms are attributed to carcinoid syndrome by the provider rather than assumed based on the presence of a neuroendocrine tumor.

Common Mistakes

HCC Buddy guidance
E34.01 (Carcinoid heart syndrome) is used when cardiac valve involvement is present.
E34.00 (Carcinoid syndrome, unspecified) is less specific and should be avoided when manifestations are documented.
C7A.xxx codes for neuroendocrine tumors should be assigned separately.
K58.x (Irritable bowel syndrome) may be confused clinically but has a different etiology.

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 E34.09 an HCC code?

Yes. E34.09 (Other carcinoid syndrome) maps to Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic under the CMS-HCC V28 risk adjustment model (and Breast, Prostate, and Other Cancers and Tumors under V24), with a community non-dual aged RAF of 4.209. It is billable for payment year 2026.

Coder answer: E34.09 is billable and maps to V28 HCC 17, Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code
E34.09
Description
Other carcinoid syndrome
HCC (V28)
HCC 17 — Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic
RAF
4.209
Billable
Yes
Payment year
2026

HCC Category Mapping

V28HCC 17, Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic
4.209
V24HCC 12, Breast, Prostate, and Other Cancers and Tumors
0.150
ESRDHCC 12, Breast, Prostate, and Other Cancers and Tumors
0.045
RxHCCHCC 22, Cancer, Other Specified Sites
0.124

Each model's RAF is its CMS base weight for that model's standard population, so 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 segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work E34.09 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for E34.09

For E34.09 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

  • 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

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed E34.09 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

E34.09 is the ICD-10-CM diagnosis code for other carcinoid syndrome. Carcinoid syndrome with symptoms other than heart involvement, such as flushing, diarrhea, or bronchospasm caused by hormone-secreting tumors. E34.09 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering disorders of other endocrine glands (e20-e35).

Under the CMS-HCC V28 risk adjustment model, E34.09 maps to Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic (HCC 17) with a community, non-dual, aged base RAF weight of 4.209. Under the older CMS-HCC V24 model, E34.09 maps to Breast, Prostate, and Other Cancers and Tumors (HCC 12) with a community, non-dual, aged base RAF weight of 0.150. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

Use this code when carcinoid syndrome is documented with manifestations other than cardiac involvement. Because E34.09 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for E34.09 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

  • •Use this code when carcinoid syndrome is documented with manifestations other than cardiac involvement
  • •Document specific symptoms (flushing, diarrhea, etc.) to support medical necessity and treatment decisions

Clinical Significance

Other carcinoid syndrome captures carcinoid syndrome manifestations that do not involve the heart, such as episodic flushing, secretory diarrhea, bronchospasm, and pellagra-like skin changes. These symptoms result from excessive serotonin and other vasoactive mediators released by neuroendocrine tumors and significantly impact quality of life and nutritional status.

Documentation Requirements

  • ✓Documentation should specify the carcinoid manifestations present (flushing episodes with frequency and triggers, diarrhea with stool frequency, bronchospasm severity, skin changes).
  • ✓Biochemical confirmation through elevated 24-hour urine 5-hydroxyindoleacetic acid or serum chromogranin A should be noted.
  • ✓The underlying neuroendocrine tumor site and treatment status must be documented.
  • ✓An echocardiogram documenting absence of cardiac involvement supports use of this code over E34.01.

Commonly Confused Codes

  • •E34.01 (Carcinoid heart syndrome) is used when cardiac valve involvement is present.
  • •E34.00 (Carcinoid syndrome, unspecified) is less specific and should be avoided when manifestations are documented.
  • •C7A.xxx codes for neuroendocrine tumors should be assigned separately.
  • •K58.x (Irritable bowel syndrome) may be confused clinically but has a different etiology.

Child Codes

E34.00Carcinoid syndrome, unspecified
HCC 17
E34.01Carcinoid heart syndrome
HCC 17
E34.09Other carcinoid syndrome
HCC 17

Code Hierarchy

└E34Other endocrine disorders└E34.0Carcinoid syndrome└E34.09Other carcinoid syndrome
└E34.09Other carcinoid syndrome

E34.09 code history

Code setChange
FY2025 (effective Oct 1, 2024)Added to the code set

Source: official CMS ICD-10-CM order and addenda files, FY2016 through FY2027.

Because E34.09 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score.

E34.09 maps to CMS-HCC V28 category 17, Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic. See the ICD-10 to HCC mapping hub for how the V28 crosswalk works. Because E34.09 carries a payment HCC, you can see what it adds to a RAF score and check the documentation the chart needs before it is submitted.

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Open E34.09 in the Code Book for the full Index-to-Tabular path, MEAT checklist, and V28 HCC mapping, or in the Encoder to code from a keyword search. Pro includes 7 days to try everything, no card required.

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