DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

G20 Parkinson's disease

  • Header · not billable

G20 is not billable. The category heads 5 billable codes in FY2027, grouped under 3 subdivisions.

Index → code

  • Hemiparkinsonism → G20.C
  • Pyramidopallidonigral syndrome → G20.C
  • Parkinsonism (idiopathic) (primary) → G20.C

Where it sits

  1. Chapter 6 Diseases of the nervous system (G00-G99)
  2. G20-G26 Extrapyramidal and movement disorders (G20-G26)
  3. G20 Parkinson's disease
Billable codes
5
Subdivisions
3
CC / MCC codes
0 / 0
HCC V28 codes
5
New FY2027
0
Index entries
23

Codes in G20

  1. G20.A
    Parkinson's disease without dyskinesia
    Header
  2. G20.A1
    Parkinson's disease without dyskinesia, without mention of fluctuations
    Billable199
    Inclusion terms 2

    Inclusion terms

    • Parkinson's disease NOS
    • Parkinson's disease without dyskinesia, without mention of OFF episodes
  3. G20.A2
    Parkinson's disease without dyskinesia, with fluctuations
    Billable199
    Inclusion terms 1

    Inclusion terms

    • Parkinson's disease without dyskinesia, with OFF episodes
  4. G20.B
    Parkinson's disease with dyskinesia
    Header
    Excludes1 1

    Excludes1

    • drug induced dystonia (G24.0-) G24.0
  5. G20.B1
    Parkinson's disease with dyskinesia, without mention of fluctuations
    Billable199
    Inclusion terms 1

    Inclusion terms

    • Parkinson's disease with dyskinesia, without mention of OFF episodes
  6. G20.B2
    Parkinson's disease with dyskinesia, with fluctuations
    Billable199
    Inclusion terms 1

    Inclusion terms

    • Parkinson's disease with dyskinesia, with OFF episodes
  7. G20.C
    Parkinsonism, unspecified
    Billable199
    Inclusion terms 1, Excludes1 4

    Inclusion terms

    • Parkinsonism, NOS

    Excludes1

    • Parkinson's disease NOS (G20.A1) G20.A1
    • Parkinson's disease with dyskinesia (G20.B-) G20.B
    • Parkinson's disease without dyskinesia (G20.A-) G20.A
    • secondary parkinsonism (G21.-) G21

Sources of each column.

Instructions

At G20

Inclusion terms

  • Hemiparkinsonism
  • Idiopathic Parkinsonism or Parkinson's disease
  • Paralysis agitans
  • Primary Parkinsonism or Parkinson's disease

Use additional code

Notes that also apply

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

Index entries

  • Hemiparkinsonism → G20.C
  • Parkinsonism (idiopathic) (primary) → G20.C
  • Pyramidopallidonigral syndrome → G20.C
  • Disease, diseasedParkinson's → G20.A1
  • Paralysis, paralytic (complete) (incomplete)agitans → G20.C
  • Parkinsonism (idiopathic) (primary)dementia → G20.C [F02.80]
  • Syndromepyramidopallidonigral → G20.C
  • Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)withParkinson's disease → G20.A1 [F02.80]
  • Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)in (due to)Parkinson's disease → G20.A1 [F02.80]
  • Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)withParkinsonism → G20.C [F02.80]
  • Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)in (due to)paralysis agitans → G20.C [F02.80]
  • Parkinsonism (idiopathic) (primary)dementiawith behavioral disturbance → G20.C [F02.81-]
  • Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)withParkinson's diseasewith behavioral disturbance → G20.A1 [F02.81-]
  • Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)withParkinsonismwith behavioral disturbance → G20.C [F02.81-]
  • Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)in (due to)paralysis agitanswith behavioral disturbance → G20.C [F02.81-]
  • Disease, diseasedParkinson'swithout dyskinesiawithout mention offluctuations → G20.A1
  • Disease, diseasedParkinson'swithout dyskinesiawithout mention ofOFF episodes → G20.A1
  • Disease, diseasedParkinson'swithout dyskinesiawithfluctuations → G20.A2
  • Disease, diseasedParkinson'swithout dyskinesiawithOFF episodes → G20.A2
  • Disease, diseasedParkinson'swith dyskinesiawithout mention offluctuations → G20.B1
  • Disease, diseasedParkinson'swith dyskinesiawithout mention ofOFF episodes → G20.B1
  • Disease, diseasedParkinson'swith dyskinesiawithfluctuations → G20.B2
  • Disease, diseasedParkinson'swith dyskinesiawithOFF episodes → G20.B2

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

Hierarchy