G59 — Mononeuropathy in diseases classified elsewhere
Is G59 billable?
Yes — G59 is billable for FY2027. G59 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. G59 may be submitted for encounters from October 1, 2026 through September 30, 2027.
G59 at a glance
| Code | G59 |
|---|---|
| Description | Mononeuropathy in diseases classified elsewhere |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
What Medicare edits apply to G59?
The Medicare Code Editor screens inpatient claims before they are grouped. These edits name G59 directly.
This code describes a manifestation of an underlying disease. The underlying condition must be sequenced before it, so it can never be the principal or first-listed diagnosis.
Which MS-DRGs does G59 group to?
G59 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.
- 073Cranial and Peripheral Nerve Disorders with MCCmedical
- 074Cranial and Peripheral Nerve Disorders without MCCmedical
Excludes1 — never code together
The conditions below can never be reported together with G59 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Code first
The underlying condition below must be sequenced before G59. G59 describes a manifestation and cannot be the principal or first-listed diagnosis.
- underlying disease
Excludes1 — never code together — inherited from G50-G59
The conditions below can never be reported together with G59 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here — inherited from Chapter 6
The conditions below are not part of G59, but a patient may have both at the same time. When documentation supports it, G59 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
How long has G59 existed?
G59 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.