2020 ICD-10-CM Diagnosis Code G56.4

Causalgia of upper limb

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • G56.4 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM G56.4 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of G56.4 - other international versions of ICD-10 G56.4 may differ.
Applicable To
  • Complex regional pain syndrome II of upper limb
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as G56.4. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • complex regional pain syndrome I of lower limb (
    ICD-10-CM Diagnosis Code G90.52

    Complex regional pain syndrome I of lower limb

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    G90.52-
    )
  • complex regional pain syndrome I of upper limb (
    ICD-10-CM Diagnosis Code G90.51

    Complex regional pain syndrome I of upper limb

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    G90.51-
    )
  • complex regional pain syndrome II of lower limb (
    ICD-10-CM Diagnosis Code G57.7

    Causalgia of lower limb

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Complex regional pain syndrome II of lower limb
    Type 1 Excludes
    • complex regional pain syndrome I of lower limb (G90.52-)
    • complex regional pain syndrome I of upper limb (G90.51-)
    • complex regional pain syndrome II of upper limb (G56.4-)
    • reflex sympathetic dystrophy of lower limb (G90.52-)
    • reflex sympathetic dystrophy of upper limb (G90.51-)
    G57.7-
    )
  • reflex sympathetic dystrophy of lower limb (
    ICD-10-CM Diagnosis Code G90.52

    Complex regional pain syndrome I of lower limb

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    G90.52-
    )
  • reflex sympathetic dystrophy of upper limb (
    ICD-10-CM Diagnosis Code G90.51

    Complex regional pain syndrome I of upper limb

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    G90.51-
    )
The following code(s) above G56.4 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to G56.4:
  • G00-G99
    2020 ICD-10-CM Range G00-G99

    Diseases of the nervous system

    Type 2 Excludes
    • 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)
    Diseases of the nervous system
  • G50-G59
    2020 ICD-10-CM Range G50-G59

    Nerve, nerve root and plexus disorders

    Type 1 Excludes
    • current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region
    • neuralgia NOS (M79.2)
    • neuritis NOS (M79.2)
    • peripheral neuritis in pregnancy (O26.82-)
    • radiculitis NOS (M54.1-)
    Nerve, nerve root and plexus disorders
  • G56
    ICD-10-CM Diagnosis Code G56

    Mononeuropathies of upper limb

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • current traumatic nerve disorder - see nerve injury by body region
    Mononeuropathies of upper limb
Clinical Information
  • A complex regional pain syndrome characterized by burning pain and marked sensitivity to touch (hyperesthesia) in the distribution of an injured peripheral nerve. Autonomic dysfunction in the form of sudomotor (i.e., sympathetic innervation to sweat glands), vasomotor, and trophic skin changes may also occur. (Adams et al., Principles of Neurology, 6th ed, p1359)
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to G56.4:
  • Type 1 Excludes: G57.7
    , G89.2
    , G89.2
    , G90.5
    , G90.5
    , M89.0
    , M89.0
    ICD-10-CM Diagnosis Code G57.7

    Causalgia of lower limb

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Complex regional pain syndrome II of lower limb
    Type 1 Excludes
    • complex regional pain syndrome I of lower limb (G90.52-)
    • complex regional pain syndrome I of upper limb (G90.51-)
    • complex regional pain syndrome II of upper limb (G56.4-)
    • reflex sympathetic dystrophy of lower limb (G90.52-)
    • reflex sympathetic dystrophy of upper limb (G90.51-)
    ICD-10-CM Diagnosis Code G89.2

    Chronic pain, not elsewhere classified

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • causalgia, lower limb (G57.7-)
    • causalgia, upper limb (G56.4-)
    • central pain syndrome (G89.0)
    • chronic pain syndrome (G89.4)
    • complex regional pain syndrome II, lower limb (G57.7-)
    • complex regional pain syndrome II, upper limb (G56.4-)
    • neoplasm related chronic pain (G89.3)
    • reflex sympathetic dystrophy (G90.5-)
    ICD-10-CM Diagnosis Code G89.2

    Chronic pain, not elsewhere classified

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • causalgia, lower limb (G57.7-)
    • causalgia, upper limb (G56.4-)
    • central pain syndrome (G89.0)
    • chronic pain syndrome (G89.4)
    • complex regional pain syndrome II, lower limb (G57.7-)
    • complex regional pain syndrome II, upper limb (G56.4-)
    • neoplasm related chronic pain (G89.3)
    • reflex sympathetic dystrophy (G90.5-)
    ICD-10-CM Diagnosis Code G90.5

    Complex regional pain syndrome I (CRPS I)

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Reflex sympathetic dystrophy
    Type 1 Excludes
    • causalgia of lower limb (G57.7-)
    • causalgia of upper limb (G56.4-)
    • complex regional pain syndrome II of lower limb (G57.7-)
    • complex regional pain syndrome II of upper limb (G56.4-)
    ICD-10-CM Diagnosis Code G90.5

    Complex regional pain syndrome I (CRPS I)

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Reflex sympathetic dystrophy
    Type 1 Excludes
    • causalgia of lower limb (G57.7-)
    • causalgia of upper limb (G56.4-)
    • complex regional pain syndrome II of lower limb (G57.7-)
    • complex regional pain syndrome II of upper limb (G56.4-)
    ICD-10-CM Diagnosis Code M89.0

    Algoneurodystrophy

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Shoulder-hand syndrome
    • Sudeck's atrophy
    Type 1 Excludes
    • causalgia, lower limb (G57.7-)
    • causalgia, upper limb (G56.4-)
    • complex regional pain syndrome II, lower limb (G57.7-)
    • complex regional pain syndrome II, upper limb (G56.4-)
    • reflex sympathetic dystrophy (G90.5-)
    ICD-10-CM Diagnosis Code M89.0

    Algoneurodystrophy

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Shoulder-hand syndrome
    • Sudeck's atrophy
    Type 1 Excludes
    • causalgia, lower limb (G57.7-)
    • causalgia, upper limb (G56.4-)
    • complex regional pain syndrome II, lower limb (G57.7-)
    • complex regional pain syndrome II, upper limb (G56.4-)
    • reflex sympathetic dystrophy (G90.5-)

Diagnosis Index entries containing back-references to G56.4:

ICD-10-CM Codes Adjacent To G56.4
G56.2 Lesion of ulnar nerve
G56.20 …… unspecified upper limb
G56.21 …… right upper limb
G56.22 …… left upper limb
G56.23 …… bilateral upper limbs
G56.3 Lesion of radial nerve
G56.30 …… unspecified upper limb
G56.31 …… right upper limb
G56.32 …… left upper limb
G56.33 …… bilateral upper limbs
G56.4 Causalgia of upper limb
G56.40 Causalgia of unspecified upper limb
G56.41 Causalgia of right upper limb
G56.42 Causalgia of left upper limb
G56.43 Causalgia of bilateral upper limbs
G56.8 Other specified mononeuropathies of upper limb
G56.80 Other specified mononeuropathies of unspecified upper limb
G56.81 Other specified mononeuropathies of right upper limb
G56.82 Other specified mononeuropathies of left upper limb
G56.83 Other specified mononeuropathies of bilateral upper limbs
G56.9 Unspecified mononeuropathy of upper limb

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.