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ICD-10-CM 2027 diagnosis code

D3A.021Benign carcinoid tumor of the cecum

✓ Billable / specific

D3A.021 is a valid, billable ICD-10-CM code for benign carcinoid tumor of the cecum. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About D3A.021

D3A.021 is the ICD-10-CM diagnosis code for benign carcinoid tumor of the cecum. It belongs to category D3A (benign neuroendocrine tumors), block D3A (benign neuroendocrine tumors) and chapter 2 (neoplasms). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within D3A.02 (benign carcinoid tumors of the appendix, large intestine, and rectum), D3A.021 is specifically for benign carcinoid tumor of the cecum. Related codes cover appendix (D3A.020), ascending colon (D3A.022), transverse colon (D3A.023), descending colon (D3A.024), sigmoid colon (D3A.025), rectum (D3A.026) and large intestine, unspecified portion (D3A.029).

Use an additional code to identify any associated endocrine syndrome, such as: carcinoid syndrome (E34.00).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 393 (Other Digestive System Diagnoses with MCC, relative weight 1.5881), DRG 394 (Other Digestive System Diagnoses with CC, relative weight 0.9228) and DRG 395 (Other Digestive System Diagnoses without CC/MCC, relative weight 0.6382), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 209.52 (benign carcinoid tumor of the cecum).

Notes that apply from higher levels

Instructions written at a parent level also apply to D3A.021.

› From D3A Benign neuroendocrine tumors
Excludes2
  • benign pancreatic islet cell tumors (D13.7)
Use additional code
  • code to identify any associated endocrine syndrome, such as:
  • carcinoid syndrome (E34.00)
Code also
  • any associated multiple endocrine neoplasia [MEN] syndromes (E31.2-)

Broader instructions also apply from Chapter 2: Neoplasms.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to D3A.021.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 209.52Benign carcinoid tumor of the cecumexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about D3A.021

Is D3A.021 billable?

Yes. D3A.021 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can D3A.021 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict D3A.021 as a principal diagnosis.

Is D3A.021 a CC or MCC?

No. D3A.021 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does D3A.021 group to?

D3A.021 is used in the MS-DRG v44.0 logic for MS-DRG 393 (Other Digestive System Diagnoses with MCC), MS-DRG 394 (Other Digestive System Diagnoses with CC) and MS-DRG 395 (Other Digestive System Diagnoses without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for D3A.021?

The CMS General Equivalence Mappings map D3A.021 to ICD-9-CM 209.52.