2027 ICD-10-CM Diagnosis Code D13.99Benign neoplasm of ill-defined sites within the digestive system
ICD-10-CM Codes›C00–D49›D10-D36›D13
- Billable — Valid for Submission
- Not Chronic
D13.99 is a billable ICD-10-CM diagnosis code for benign neoplasm of ill-defined sites within the digestive system. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 393 through 395. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Benign neoplasms.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Benign neoplasm of digestive organ
- Benign neoplasm of gastrointestinal tract
- Benign neoplasm of intestinal tract
- Benign neoplasm of Meckel's diverticulum
- Benign neoplasm of spleen
- Benign stromal neoplasm of gastrointestinal tract
- Hamartoma of intestine
- Hamartomatous polyposis of gastrointestinal tract
- Hemangioendothelioma
- Juvenile polyposis of gastrointestinal tract
- Littoral cell angioma
- Neoplasm of Meckel's diverticulum
- Neoplasm of uncertain behavior of spleen
- Red pulp hamartoma
- Splenic hamartoma
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to D13.99: its own notes plus those printed at D13 and Chapter 2. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Benign neoplasm of digestive system NOS
- Benign neoplasm of intestine NOS
- Benign neoplasm of spleen
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Notes
General instructions on how these codes are used.
- Functional activity
- All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
- Morphology [Histology]
- Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
- Primary malignant neoplasms overlapping site boundaries
- A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
- Malignant neoplasm of ectopic tissue
- Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Table of NeoplasmsClinical
Anatomical sites in the Table of Neoplasms that reference this code family.
| Site | Malig. Primary | Malig. Secondary | Ca in situ | Benign | Uncertain | Unspec. |
|---|---|---|---|---|---|---|
| alimentary canal or tract NEC | C26.9 | C78.80 | D01.9 | D13.99 | D37.9 | D49.0 |
| digestive organs, system, tube, or tract NEC | C26.9 | C78.89 | D01.9 | D13.99 | D37.9 | D49.0 |
| gastrocolic | C26.9 | C78.89 | D01.9 | D13.99 | D37.9 | D49.0 |
| gastrointestinal (tract) NEC | C26.9 | C78.89 | D01.9 | D13.99 | D37.9 | D49.0 |
| intestine, intestinal | C26.0 | C78.80 | D01.40 | D13.99 | D37.8 | D49.0 |
| intestine, intestinal › tract NEC | C26.0 | C78.89 | D01.40 | D13.99 | D37.8 | D49.0 |
| spleen, splenic NEC | C26.1 | C78.89 | D01.7 | D13.99 | D37.8 | D49.0 |
Patient EducationClinical
Benign Tumors
Tumors are abnormal growths in your body. They can be either benign or malignant. Benign tumors aren't cancer. Malignant ones are. Benign tumors grow only in one place. They cannot spread or invade other parts of your body. Even so, they can be dangerous if they press on vital organs, such as your brain.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code History & ChangesHistory
Replacement D13.99 replaces the following previously assigned code(s):
- D13.9 - Benign neoplasm of ill-defined sites within the dgstv sys
Questions About D13.99Overview
What is the ICD-10 code for benign neoplasm of ill-defined sites within the digestive system?
The ICD-10-CM code for benign neoplasm of ill-defined sites within the digestive system is D13.99 (sometimes written as D1399). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is D13.99 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report benign neoplasm of ill-defined sites within the digestive system on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does D13.99 group to?
When benign neoplasm of ill-defined sites within the digestive system is the principal diagnosis on an inpatient stay, it groups to MS-DRG 394, 395, 393, with relative weights from 0.6379 to 1.5877 depending on complications. Higher weights mean higher Medicare reimbursement.
Can D13.99 be reported with D21.4?
Not as a rule. The Excludes1 note at D13, which applies to D13.99, lists "benign stromal tumors of digestive system (D21.4)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
