ICD-10-CM 2027 diagnosis code
D13.99Benign neoplasm of ill-defined sites within the digestive system
D13.99 is a valid, billable ICD-10-CM code for benign neoplasm of ill-defined sites within the digestive system. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Benign neoplasm of ill-defined sites within the dgstv sys
Code last changed in FY2024 (effective October 1, 2023). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About D13.99
D13.99 is the ICD-10-CM diagnosis code for benign neoplasm of ill-defined sites within the digestive system. It belongs to category D13 (benign neoplasm of other and ill-defined parts of digestive system), block D10-D36 (benign neoplasms, except 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 D13.9 (benign neoplasm of ill-defined sites within the digestive system), D13.99 is specifically for benign neoplasm of ill-defined sites within the digestive system. Related codes cover familial adenomatous polyposis (D13.91).
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 was added in FY2024, effective October 1, 2023.
Coding notes
- Benign neoplasm of digestive system NOS
- Benign neoplasm of intestine NOS
- Benign neoplasm of spleen
Notes that apply from higher levels
Instructions written at a parent level also apply to D13.99.
› From D13 Benign neoplasm of other and ill-defined parts of digestive system
- benign stromal tumors of digestive system (D21.4)
Broader instructions also apply from Chapter 2: Neoplasms.
Table of Drugs & Neoplasms entries
- Neoplasm, neoplastic › alimentary canal or tract NEC — Benign
- Neoplasm, neoplastic › digestive organs, system, tube, or tract NEC — Benign
- Neoplasm, neoplastic › gastrocolic — Benign
- Neoplasm, neoplastic › gastrointestinal (tract) NEC — Benign
- Neoplasm, neoplastic › intestine, intestinal — Benign
- Neoplasm, neoplastic › intestine, intestinal › tract NEC — Benign
- Neoplasm, neoplastic › spleen, splenic NEC — Benign
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.
MDC 06 · Diseases and Disorders of the Digestive System
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2024 (effective 10/1/2023): Added
- No changes since FY2024.
Common questions about D13.99
Is D13.99 billable?
- Yes. D13.99 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can D13.99 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict D13.99 as a principal diagnosis.
Is D13.99 a CC or MCC?
- No. D13.99 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does D13.99 group to?
- D13.99 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.