2026 ICD-10-CM Diagnosis Code D37.01Neoplasm of uncertain behavior of lip
ICD-10-CM Codes›C00–D49›D37-D48›D37
- Billable — Valid for Submission
- Not Chronic
D37.01 is a billable ICD-10-CM diagnosis code for neoplasm of uncertain behavior of lip. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 146 through 148. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neoplasms of unspecified nature or uncertain behavior.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Neoplasm of commissure of lip
- Neoplasm of uncertain behavior of commissure of lip
- Neoplasm of uncertain behavior of inner aspect of lip
- Neoplasm of uncertain behavior of inner aspect of lower lip
- Neoplasm of uncertain behavior of inner aspect of upper lip
- Neoplasm of uncertain behavior of lip
- Neoplasm of uncertain behavior of lip, oral cavity and pharynx
- Neoplasm of uncertain behavior of vermilion border of lip
- Neoplasm of uncertain behavior of vermilion border of lower lip
- Neoplasm of uncertain behavior of vermilion border of upper lip
- Neoplasm of vermilion border of upper lip
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Neoplasm of uncertain behavior of vermilion border of lip
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
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. |
|---|---|---|---|---|---|---|
| commissure | C00.6 | C79.89 | D00.01 | D10.39 | D37.01 | D49.0 |
| commissure › labial, lip | C00.6 | C79.89 | D00.01 | D10.39 | D37.01 | D49.0 |
| labial [See Also: Neoplasm, lip] | C00.9 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip | C00.9 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › commissure | C00.6 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › external | C00.2 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › external › lower | C00.1 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › external › upper | C00.0 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › internal | C00.5 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › internal › lower | C00.4 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › internal › upper | C00.3 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › lipstick area | C00.2 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › lipstick area › lower | C00.1 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › lipstick area › upper | C00.0 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › lower | C00.1 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › lower › internal | C00.4 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › upper | C00.0 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › upper › internal | C00.3 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › vermilion border | C00.2 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › vermilion border › lower | C00.1 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
| lip › vermilion border › upper | C00.0 | C79.89 | D00.01 | D10.0 | D37.01 | D49.0 |
Patient EducationClinical
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Convert D37.01 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About D37.01Overview
Is D37.01 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report neoplasm of uncertain behavior of lip on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does D37.01 group to?
When neoplasm of uncertain behavior of lip is the principal diagnosis on an inpatient stay, it groups to MS-DRG 146, 147, 148, with relative weights from 0.7971 to 2.1174 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of D37.01?
Under the General Equivalence Mappings, neoplasm of uncertain behavior of lip converts to ICD-9-CM 235.1 (unc behav neo oral/phar). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
