DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

G13 Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere

  • Header · not billable

G13 is not billable. The category heads 4 billable codes in FY2027: the 4 codes directly below it.

Index → code

  • Atrophy, atrophic (of)systemic affecting central nervous systeminspecified disease NEC → G13.8

Where it sits

  1. Chapter 6 Diseases of the nervous system (G00-G99)
  2. G10-G14 Systemic atrophies primarily affecting the central nervous system (G10-G14)
  3. G13 Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere
Billable codes
4
Subdivisions
4
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
7

Codes in G13

  1. G13.0
    Paraneoplastic neuromyopathy and neuropathy
    Billable
    Inclusion terms 2, Code first 1

    Inclusion terms

    • Carcinomatous neuromyopathy
    • Sensorial paraneoplastic neuropathy [Denny Brown]

    Code first

    • underlying neoplasm (C00-D49) C00 D49
  2. G13.1
    Other systemic atrophy primarily affecting central nervous system in neoplastic disease
    Billable
    Inclusion terms 1, Code first 1

    Inclusion terms

    • Paraneoplastic limbic encephalopathy

    Code first

    • underlying neoplasm (C00-D49) C00 D49
  3. G13.2
    Systemic atrophy primarily affecting the central nervous system in myxedema
    Billable
    Code first 3

    Code first

    • underlying disease, such as:
    • hypothyroidism (E03.-) E03
    • myxedematous congenital iodine deficiency (E00.1) E00.1
  4. G13.8
    Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere
    Billable
    Code first 1

    Code first

    • underlying disease

Sources of each column.

Instructions

Notes that also apply

Chapter 6 instructions (Excludes2 8): printed on the chapter 6 page.

Index entries

  • Neuromyopathyparaneoplastic (see also, Neoplasm, by site, if known) → D49.9 [G13.0]
  • Neuropathy, neuropathicparaneoplastic (sensorial) (Denny Brown) (see also, Neoplasm, by site, if known) → D49.9 [G13.0]
  • Encephalopathy (acute)in (due to) (with)neoplastic disease (see also Neoplasm) → D49.9 [G13.1]
  • Atrophy, atrophic (of)systemic affecting central nervous systeminneoplastic disease → D49.9 [G13.1]
  • Ataxia, ataxy, ataxiccerebellar (hereditary)inmyxedema → E03.9 [G13.2]
  • Atrophy, atrophic (of)systemic affecting central nervous systeminmyxedema → E03.9 [G13.2]
  • Atrophy, atrophic (of)systemic affecting central nervous systeminspecified disease NEC → G13.8

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy