DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

G73 Disorders of myoneural junction and muscle in diseases classified elsewhere

  • Header · not billable

G73 is not billable. The category heads 3 billable codes in FY2027: the 3 codes directly below it.

Index → code

  • SyndromeLambert-Eatoninneoplastic disease → G73.1

Where it sits

  1. Chapter 6 Diseases of the nervous system (G00-G99)
  2. G70-G73 Diseases of myoneural junction and muscle (G70-G73)
  3. G73 Disorders of myoneural junction and muscle in diseases classified elsewhere
Billable codes
3
Subdivisions
3
CC / MCC codes
2 / 0
HCC V28 codes
2
New FY2027
0
Index entries
31

Codes in G73

  1. G73.1
    Lambert-Eaton syndrome in neoplastic disease
    BillableCC196
    Excludes1 1, Code first 1

    Excludes1

    • Lambert-Eaton syndrome not associated with neoplasm (G70.80-G70.81) G70.80 G70.81

    Code first

    • underlying neoplasm (C00-D49) C00 D49
  2. G73.3
    Myasthenic syndromes in other diseases classified elsewhere
    BillableCC196
    Code first 3

    Code first

    • underlying disease, such as:
    • neoplasm (C00-D49) C00 D49
    • thyrotoxicosis (E05.-) E05
  3. G73.7
    Myopathy in diseases classified elsewhere
    Billable
    Excludes1 6, Code first 5

    Excludes1

    • myopathy in:
    • rheumatoid arthritis (M05.32) M05.32
    • sarcoidosis (D86.87) D86.87
    • scleroderma (M34.82) M34.82
    • Sjögren syndrome (M35.03) M35.03
    • systemic lupus erythematosus (M32.19) M32.19

    Code first

    • underlying disease, such as:
    • glycogen storage disease (E74.0-) E74.0
    • hyperparathyroidism (E21.0, E21.3) E21.0 E21.3
    • hypoparathyroidism (E20.-) E20
    • lipid storage disorders (E75.-) E75

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

Notes that also apply

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

Index entries

  • Hoffmann's syndrome → E03.9 [G73.7]
  • Myopathyendocrine NEC → E34.9 [G73.7]
  • Myopathyin (due to)parasitic disease NEC → B89 [G73.7]
  • Myopathyin (due to)infectious disease NEC → B99 [G73.7]
  • Myopathyin (due to)cretinism → E00.9 [G73.7]
  • Myopathyin (due to)hypothyroidism → E03.9 [G73.7]
  • Myopathyin (due to)myxedema → E03.9 [G73.7]
  • Myopathyin (due to)thyrotoxicosis (hyperthyroidism) → E05.90 [G73.7]
  • Myopathyin (due to)hypoparathyroidism → E20.9 [G73.7]
  • Myopathyin (due to)hyperparathyroidism NEC → E21.3 [G73.7]
  • Myopathyin (due to)hypopituitarism → E23.0 [G73.7]
  • Myopathyin (due to)Cushing's syndrome → E24.9 [G73.7]
  • Myopathyin (due to)hyperadrenocorticism → E24.9 [G73.7]
  • Myopathyin (due to)Addison's disease → E27.1 [G73.7]
  • Myopathyin (due to)endocrine disease NEC → E34.9 [G73.7]
  • Myopathyin (due to)glycogen storage disease → E74.00 [G73.7]
  • Myopathyin (due to)lipid storage disease → E75.6 [G73.7]
  • Myopathyin (due to)amyloidosis → E85.0 [G73.7]
  • Myopathyin (due to)metabolic disease NEC → E88.9 [G73.7]
  • Myopathyin (due to)polyarteritis nodosa → M30.0 [G73.7]
  • Myopathyin (due to)giant cell arteritis → M31.6 [G73.7]
  • Myastheniasyndromeinneoplastic disease → D49.9 [G73.3]
  • Syndromemyasthenicinneoplastic disease → D49.9 [G73.3]
  • Myastheniasyndromeinpernicious anemia → D51.0 [G73.3]
  • Myastheniasyndromeinthyrotoxicosis → E05.90 [G73.3]
  • Syndromemyasthenicinthyrotoxicosis (hyperthyroidism) → E05.90 [G73.3]
  • Myopathyin (due to)thyrotoxicosis (hyperthyroidism)with thyroid storm → E05.91 [G73.7]
  • Syndromemyasthenicinendocrine disease NEC → E34.9 [G73.3]
  • SyndromeLambert-Eatoninneoplastic disease → G73.1
  • Myastheniasyndromeinthyrotoxicosiswith thyroid storm → E05.91 [G73.3]
  • Syndromemyasthenicinthyrotoxicosis (hyperthyroidism)with thyroid storm → E05.91 [G73.3]

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

Hierarchy