G13.2

Systemic atrophy primarily affecting the central nervous system in myxedema

FY2027Chapter 6: Diseases of the nervous system/G10–G14 Systemic atrophies primarily affecting the central nervous system

BillableComplete code, valid to report

Code first
Excludes2

Care settingsHospice: not accepted as primary IPF Primary · MS-DRG 056–057

G13.2 (also written G132) is a billable ICD-10-CM diagnosis code for systemic atrophy primarily affecting the central nervous system in myxedema. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 4 codes in category G13 (Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere). The Alphabetic Index lists it under 2 entries. Its coding notes include a Code first instruction and 8 Excludes2 entries.

Code first

If the underlying condition listed here is present and known, sequence it first.

This code

underlying disease, such as:
- hypothyroidism (E03.-)
- myxedematous congenital iodine deficiency (E00.1)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (8 notes)

Inherited from Chapter 6 Diseases of the nervous system

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)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Hospice: not accepted as primary

Not accepted as the principal diagnosis on a hospice claim (bill types 081x and 082x). The Integrated OCE returns an edit for this code.
Reason: Manifestation code. Report the underlying condition first (see the Code first note).

Source: CMS Integrated Outpatient Code Editor (IOCE) v27.3, effective October 1, 2026, edit 86

IPF Primary

IPF MS-DRG adjustment. A principal diagnosis of this code groups to one of these MS-DRGs. Which one depends on other facts of the stay, so the factor is a range:

MS-DRG	Description	Factor
056	Degenerative nervous system disorders w MCC	1.12
057	Degenerative nervous system disorders w/o MCC	1.11

A principal diagnosis that groups to none of the 19 designated MS-DRGs gets no MS-DRG adjustment. Otherwise the claim still receives the federal per diem base rate and the other adjustments.

Source: CMS IPF PPS FY 2027 final rule (CMS-1847-F), Addendum A; code lists from the CMS MS-DRG Definitions Manual v44; effective for discharges on or after October 1, 2026

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 2 entries