2026 ICD-10-CM Diagnosis Code D42.1Neoplasm of uncertain behavior of spinal meninges
ICD-10-CM Codes›C00–D49›D37-D48›D42
- Billable — Valid for Submission
- Chronic Condition
D42.1 is a billable ICD-10-CM diagnosis code for neoplasm of uncertain behavior of spinal meninges. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as neoplasm of uncertain behavior of meninges. 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 uncertain behavior of meninges
- Neoplasm of uncertain behavior of spinal cord
- Neoplasm of uncertain behavior of spinal intradural extramedullary space
- Neoplasm of uncertain behavior of spinal intradural intramedullary space
- Neoplasm of uncertain behavior of spinal meninges
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. |
|---|---|---|---|---|---|---|
| arachnoid › spinal | C70.1 | C79.49 | – | D32.1 | D42.1 | D49.7 |
| dura (cranial) (mater) › spinal | C70.1 | C79.49 | – | D32.1 | D42.1 | D49.7 |
| meninges › spinal (cord) | C70.1 | C79.49 | – | D32.1 | D42.1 | D49.7 |
| pia mater › spinal | C70.1 | C79.49 | – | D32.1 | D42.1 | D49.7 |
| spine, spinal (column) › dura mater | C70.1 | C79.49 | – | D32.1 | D42.1 | D49.7 |
| spine, spinal (column) › membrane | C70.1 | C79.49 | – | D32.1 | D42.1 | D49.7 |
| spine, spinal (column) › meninges | C70.1 | C79.49 | – | D32.1 | D42.1 | D49.7 |
| spine, spinal (column) › pia mater | C70.1 | C79.49 | – | D32.1 | D42.1 | D49.7 |
Patient EducationClinical
Spinal Cord Diseases
Your spinal cord is a bundle of nerves that runs down the middle of your back. It carries signals back and forth between your body and your brain. It is protected by your vertebrae, which are the bone disks that make up your spine.
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Convert D42.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About D42.1Overview
Is D42.1 (Neoplasm of uncertain behavior of meninges) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report neoplasm of uncertain behavior of spinal meninges on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What is the ICD-9 equivalent of D42.1?
Under the General Equivalence Mappings, neoplasm of uncertain behavior of spinal meninges converts to ICD-9-CM 237.6 (unc behav neo meninges). 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.
