2026 ICD-10-CM Diagnosis Code C7A.8Other malignant neuroendocrine tumors

Billable — Valid for Submission
Chronic Condition

ICD-10-CM C7A.8

CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C7A.8 is a billable ICD-10-CM diagnosis code for other malignant neuroendocrine tumors. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 826 through 830, 843 through 845. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Malignant neuroendocrine tumors.

Code Identity

ICD-10-CM Code

C7A.8

Billable Status

Yes — Valid for Submission

Code Describes

Other malignant neuroendocrine tumors

Short Description

Other malignant neuroendocrine tumors

Same as the full description in the CMS dataset.

Parent Code

C7A

Malignant neuroendocrine tumors

Code Classification

ChapterC00–D49Neoplasms

SectionC7AMalignant neuroendocrine tumors

CategoryC7AMalignant neuroendocrine tumors

This CodeC7A.8Other malignant neuroendocrine tumors

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

Filter synonyms:

Carcinoma of appendix
Carcinoma of body of stomach
Carcinoma of cardia
Carcinoma of cervix
Carcinoma of duodenum
Carcinoma of gallbladder
Carcinoma of nasal cavity
Carcinoma of prostate
Carcinoma of urinary bladder
Familial gastric type 1 neuroendocrine neoplasm
Gastric inhibitory peptide-secreting tumor of pancreas
Growth hormone releasing factor-secreting tumor of pancreas
High-grade neuroendocrine carcinoma of cervix uteri
High-grade neuroendocrine carcinoma of corpus uteri
Large cell neuroendocrine carcinoma of lung
Malignant glomus tumor
Malignant neoplasm of ampulla of Vater
Malignant neoplasm of cecum
Malignant neoplasm of hepatic duct
Malignant neoplasm of ileum
Malignant neoplasm of jejunum
Malignant neoplasm of pyloric antrum
Malignant neuroendocrine neoplasm of nasal cavity
Malignant perivascular epithelioid cell neoplasm
Metastatic pancreatic endocrine carcinoma
Metastatic well-differentiated neuroendocrine neoplasm to bone
Metastatic well-differentiated neuroendocrine tumor
Mixed ductal-neuroendocrine carcinoma of pancreas
Mixed neuroendocrine-non neuroendocrine neoplasm of pancreas
Neoplasm of cystic duct
Neuroendocrine carcinoma
Neuroendocrine carcinoma of anus
Neuroendocrine carcinoma of appendix
Neuroendocrine carcinoma of gallbladder
Neuroendocrine carcinoma of pancreas
Neuroendocrine carcinoma of thymus
Neuroendocrine neoplasm of appendix
Neuroendocrine neoplasm of ascending colon
Neuroendocrine neoplasm of bronchus
Neuroendocrine neoplasm of duodenum
Neuroendocrine neoplasm of gallbladder
Neuroendocrine neoplasm of ileum
Neuroendocrine neoplasm of jejunum
Neuroendocrine neoplasm of large intestine
Neuroendocrine neoplasm of liver
Neuroendocrine neoplasm of pancreas
Neuroendocrine neoplasm of rectum
Neuroendocrine neoplasm of sigmoid colon
Neuroendocrine neoplasm of transverse colon
Neuroendocrine neoplasm, malignant
Non-functioning neuroendocrine neoplasm of pancreas
Overlapping malignant neoplasm of stomach
Parathyroid hormone-related peptide-secreting tumor of pancreas
Primary carcinoma liver and/or biliary system
Primary carcinoma of body of stomach
Primary carcinoma of cardia
Primary carcinoma of cervix
Primary carcinoma of colon
Primary carcinoma of duodenum
Primary carcinoma of gallbladder
Primary carcinoma of prostate
Primary carcinoma of urinary bladder
Primary hepatic neuroendocrine carcinoma
Primary malignant neoplasm of ampulla of Vater
Primary malignant neoplasm of anal canal
Primary malignant neoplasm of appendix
Primary malignant neoplasm of body of stomach
Primary malignant neoplasm of cardia of stomach
Primary malignant neoplasm of common bile duct
Primary malignant neoplasm of cystic duct
Primary malignant neoplasm of duodenum
Primary malignant neoplasm of gallbladder
Primary malignant neoplasm of ileum
Primary malignant neoplasm of jejunum
Primary malignant neoplasm of pancreatic duct
Primary malignant neoplasm of prostate
Primary malignant neoplasm of pyloric antrum
Primary malignant neoplasm of rectum
Primary malignant neuroendocrine neoplasm of ampulla of Vater
Primary malignant neuroendocrine neoplasm of anal canal
Primary malignant neuroendocrine neoplasm of anus
Primary malignant neuroendocrine neoplasm of appendix
Primary malignant neuroendocrine neoplasm of ascending colon
Primary malignant neuroendocrine neoplasm of biliary tract
Primary malignant neuroendocrine neoplasm of body of stomach
Primary malignant neuroendocrine neoplasm of bronchus
Primary malignant neuroendocrine neoplasm of cardia of stomach
Primary malignant neuroendocrine neoplasm of cecum
Primary malignant neuroendocrine neoplasm of colon
Primary malignant neuroendocrine neoplasm of cystic duct
Primary malignant neuroendocrine neoplasm of distal bile duct
Primary malignant neuroendocrine neoplasm of duodenum
Primary malignant neuroendocrine neoplasm of esophagus
Primary malignant neuroendocrine neoplasm of ileum
Primary malignant neuroendocrine neoplasm of jejunum
Primary malignant neuroendocrine neoplasm of large intestine
Primary malignant neuroendocrine neoplasm of lung
Primary malignant neuroendocrine neoplasm of pancreas
Primary malignant neuroendocrine neoplasm of perihilar bile duct
Primary malignant neuroendocrine neoplasm of pyloric antrum of stomach
Primary malignant neuroendocrine neoplasm of rectum
Primary malignant neuroendocrine neoplasm of small intestine
Primary malignant neuroendocrine neoplasm of uterus
Primary malignant perivascular epithelioid cell neoplasm
Primary mixed acinar endocrine-ductal carcinoma of pancreas
Primary neuroendocrine carcinoma of body of stomach
Primary neuroendocrine carcinoma of cardia of stomach
Primary neuroendocrine carcinoma of cervix uteri
Primary neuroendocrine carcinoma of colon
Primary neuroendocrine carcinoma of duodenum
Primary neuroendocrine carcinoma of esophagus
Primary neuroendocrine carcinoma of gallbladder
Primary neuroendocrine carcinoma of overlapping sites of stomach
Primary neuroendocrine carcinoma of pyloric antrum of stomach
Primary neuroendocrine carcinoma of rectum
Primary neuroendocrine carcinoma of small intestine
Primary neuroendocrine carcinoma of stomach
Primary small cell neuroendocrine carcinoma of prostate
Primary small cell neuroendocrine carcinoma of urinary bladder
Primary well-differentiated neuroendocrine tumor of pancreas
Serotonin level above reference range
Serotonin-producing neuroendocrine neoplasm of pancreas
Small cell neuroendocrine carcinoma of ovary
Small cell neuroendocrine carcinoma of prostate
Small cell neuroendocrine carcinoma of urinary bladder
Well-differentiated neuroendocrine tumor of ascending colon
Well-differentiated neuroendocrine tumor of cecum
Well-differentiated neuroendocrine tumor of colon
Well-differentiated neuroendocrine tumor of descending colon
Well-differentiated neuroendocrine tumor of duodenum
Well-differentiated neuroendocrine tumor of stomach

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

- Tumor - See Also: Neoplasm, unspecified behavior, by site;
- - neuroendocrine - D3A.8
  - - specified NEC - C7A.8

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

Tumor

neuroendocrine

specified NEC

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NEO066

Malignant neuroendocrine tumors

Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Cancer

Cancer is not just one disease but many diseases. Cancer begins in your cells, which are the building blocks of your body. Usually, your body forms new cells as needed, replacing old cells that die. Sometimes this process goes wrong. New cells grow even when you don't need them, and old cells don't die when they should.

The full article covers:

What is cancer?
What are the types of cancer?
How does cancer develop?
What are the symptoms of cancer?
How is cancer diagnosed?
What are the treatments for cancer?
Can cancer be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert C7A.8 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM

209.30 Malig neuroendo ca NOS

Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.

FY 2017–2025No changes

FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C7A.8Overview

Is C7A.8 (Malignant neuroendocrine tumors) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other malignant neuroendocrine tumors on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C7A.8 group to?

When other malignant neuroendocrine tumors is the principal diagnosis on an inpatient stay, it groups to MS-DRG 826, 827, 828, 829, 830, 843, 844, 845, with relative weights from 0.8516 to 4.6778 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of C7A.8?

Under the General Equivalence Mappings, other malignant neuroendocrine tumors converts to ICD-9-CM 209.30 (malig neuroendo ca NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
The condition places limitations on self-care, independent living, and social interactions.

Indicator	Meaning	CMS pays CC/MCC DRG
Y	Diagnosis was present at the time of inpatient admission	Yes
N	Diagnosis was not present at the time of admission	No
U	Documentation is insufficient to determine	No
W	Clinically undetermined	Yes
1	Unreported, exempt from POA reporting	No