Mononeuropathies of upper limb (G56) ICD-10-CM
The G56 code range covers mononeuropathies of upper limb with 36 ICD-10-CM diagnosis codes. 28 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- current traumatic nerve disorder - see nerve injury by body region
Codes in the G56 Range 36 codes · 28 billable
- G56 Mononeuropathies of upper limbNon-billable
- G56.0 Carpal tunnel syndromeNon-billable
- G56.00 Carpal tunnel syndrome, unspecified upper limb
- G56.01 Carpal tunnel syndrome, right upper limb
- G56.02 Carpal tunnel syndrome, left upper limb
- G56.03 Carpal tunnel syndrome, bilateral upper limbs
- G56.1 Other lesions of median nerveNon-billable
- G56.10 Other lesions of median nerve, unspecified upper limb
- G56.11 Other lesions of median nerve, right upper limb
- G56.12 Other lesions of median nerve, left upper limb
- G56.13 Other lesions of median nerve, bilateral upper limbs
- G56.2 Lesion of ulnar nerveNon-billable
- G56.20 Lesion of ulnar nerve, unspecified upper limb
- G56.21 Lesion of ulnar nerve, right upper limb
- G56.22 Lesion of ulnar nerve, left upper limb
- G56.23 Lesion of ulnar nerve, bilateral upper limbs
- G56.3 Lesion of radial nerveNon-billable
- G56.30 Lesion of radial nerve, unspecified upper limb
- G56.31 Lesion of radial nerve, right upper limb
- G56.32 Lesion of radial nerve, left upper limb
- G56.33 Lesion of radial nerve, bilateral upper limbs
- G56.4 Causalgia of upper limbNon-billable
- 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 limbNon-billable
- 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 limbNon-billable
- G56.90 Unspecified mononeuropathy of unspecified upper limb
- G56.91 Unspecified mononeuropathy of right upper limb
- G56.92 Unspecified mononeuropathy of left upper limb
- G56.93 Unspecified mononeuropathy of bilateral upper limbs
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the G56 range.
Carpal Tunnel Syndrome
Entrapment of the MEDIAN NERVE in the carpal tunnel, which is formed by the flexor retinaculum and the CARPAL BONES. This syndrome may be associated with repetitive occupational trauma (CUMULATIVE TRAUMA DISORDERS); wrist injuries; AMYLOID NEUROPATHIES; rheumatoid arthritis (see ARTHRITIS, RHEUMATOID); ACROMEGALY; PREGNANCY; and other conditions. Symptoms include burning pain and paresthesias involving the ventral surface of the hand and fingers which may radiate proximally. Impairment of sensation in the distribution of the median nerve and thenar muscle atrophy may occur. (Joynt, Clinical Neurology, 1995, Ch51, p45)
Causalgia
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)
About the G56 Code Range
These disorders affect individual nerves in an upper limb. The groups distinguish carpal tunnel syndrome, problems involving specific nerves, and other upper-limb nerve disorders.
G56.0 identifies carpal tunnel syndrome. G56.1, G56.2, and G56.3 distinguish problems involving the median, ulnar, and radial nerves. The remaining groups identify another named condition, other specified disorders, or an unspecified disorder. Each group then separates unspecified, right, left, and both upper limbs.
Questions About This Page
How many billable codes are in the G56 range?
Of the 36 codes in this range, 28 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the G56 range classify?
The range classifies mononeuropathies of upper limb. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
