D43.9 — Neoplasm of uncertain behavior of central nervous system, unspecified
Is D43.9 billable?
Yes, but D43.9 is an unspecified code. D43.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, D43.9 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting D43.9 — the more specific alternatives are listed below.
D43.9 at a glance
| Code | D43.9 |
|---|---|
| Description | Neoplasm of uncertain behavior of central nervous system, unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does D43.9 group to?
D43.9 sits in MDC 01 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 054Nervous System Neoplasms with MCCmedical
- 055Nervous System Neoplasms without MCCmedical
Inclusion terms
Alternative wording in documentation that is classified to D43.9.
- Neoplasm of uncertain behavior of nervous system (central) NOS
Excludes1 — never code together — inherited from D37-D48
The conditions below can never be reported together with D43.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- neoplasms of unspecified behavior (D49.-)
Excludes1 — never code together — inherited from D43
The conditions below can never be reported together with D43.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- neoplasm of uncertain behavior of peripheral nerves and autonomic nervous system (D48.2)
How long has D43.9 existed?
D43.9 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
What other codes are in the D43 family? (6)
- D43.0Neoplasm of uncertain behavior of brain, supratentorial
- D43.1Neoplasm of uncertain behavior of brain, infratentorial
- D43.2Neoplasm of uncertain behavior of brain, unspecified
- D43.3Neoplasm of uncertain behavior of cranial nerves
- D43.4Neoplasm of uncertain behavior of spinal cord
- D43.8Neoplasm of uncertain behavior of other specified parts of central nervous system