D42 vs D49
D42 (Neoplasm of uncertain behavior of meninges) compared with D49 (Neoplasms of unspecified behavior), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. D42 carries an Excludes1 note covering D49: “neoplasms of unspecified behavior (D49.-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| D42Neoplasm of uncertain behavior of meninges | D49Neoplasms of unspecified behavior | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Neoplasm of uncertain behavior of meninges is a non-billable ICD-10-CM category code (D42). | Neoplasms of unspecified behavior is a non-billable ICD-10-CM category code (D49). |
| Includes | — | 'growth' NOS neoplasm NOS new growth NOS tumor NOS |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources