G99.0 — Autonomic neuropathy in diseases classified elsewhere
Is G99.0 billable?
Yes — G99.0 is billable for FY2027. G99.0 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. G99.0 may be submitted for encounters from October 1, 2026 through September 30, 2027.
G99.0 at a glance
| Code | G99.0 |
|---|---|
| Description | Autonomic neuropathy 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 G99.0?
The Medicare Code Editor screens inpatient claims before they are grouped. These edits name G99.0 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 G99.0 group to?
G99.0 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
As a secondary diagnosis, G99.0 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is G99.0 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to G99.0. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Neuropathy, neuropathic › peripheral › autonomic › in › amyloidosis
- Neuropathy, neuropathic › peripheral › autonomic › in › endocrine disease NEC
- Neuropathy, neuropathic › peripheral › autonomic › in › gout
- Neuropathy, neuropathic › peripheral › autonomic › in › hyperthyroidism
- Neuropathy, neuropathic › peripheral › autonomic › in › metabolic disease NEC
- Neuropathy, neuropathic › peripheral › autonomic › in › hyperthyroidism › with thyroid storm
Excludes1 — never code together
The conditions below can never be reported together with G99.0 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- diabetic autonomic neuropathy (E08-E13 with .43)
Code first
The underlying condition below must be sequenced before G99.0. G99.0 describes a manifestation and cannot be the principal or first-listed diagnosis.
Excludes2 — not included here — inherited from Chapter 6
The conditions below are not part of G99.0, but a patient may have both at the same time. When documentation supports it, G99.0 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 G99.0 existed?
G99.0 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.
Which codes are confused with G99.0?
ICD-10-CM declares these codes mutually exclusive with G99.0 — exactly one of each pair can be correct for a given encounter.