G90.2 — Horner's syndrome

Billable

Is G90.2 billable?

Yes — G90.2 is billable for FY2027. G90.2 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. G90.2 may be submitted for encounters from October 1, 2026 through September 30, 2027.

G90.2 at a glance

Code	G90.2
Description	Horner's syndrome
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Which MS-DRGs does G90.2 group to?

G90.2 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

How is G90.2 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to G90.2. They show the wording a clinician may have documented, which often differs from the Tabular description.

Bernard-Horner syndrome
Claude Bernard-Horner syndrome
Hornersyndrome (-Claude Bernard)
Dystrophy, dystrophia › cervical sympathetic
Syndrome › Horner's
Dystrophy, dystrophia › sympathetic › cervical
Syndrome › cervical › sympathetic paralysis
Syndrome › sympathetic › cervical paralysis

Inclusion terms

Alternative wording in documentation that is classified to G90.2.

Bernard(-Horner) syndrome
Cervical sympathetic dystrophy or paralysis

Excludes1 — never code together — inherited from G90

The conditions below can never be reported together with G90.2 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

dysfunction of the autonomic nervous system due to alcohol (G31.2)

Excludes2 — not included here — inherited from Chapter 6

The conditions below are not part of G90.2, but a patient may have both at the same time. When documentation supports it, G90.2 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 G90.2 existed?

G90.2 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.