Numbness, tingling, burning feet, a hand that "falls asleep" every night. Peripheral neuropathy complaints are among the most common reasons patients see a neurologist, and they regularly show up at urgent care as well. They are also among the easiest to code vaguely. "Neuropathy" in a chart note can point to a dozen different code families, and payers expect the diagnosis to match the nerve studies, imaging, and treatments being billed.
The G50–G59 (nerve, nerve root, and plexus disorders) and G60–G65 (polyneuropathies) blocks of ICD-10-CM, along with the diabetes combination codes in Chapter 4, cover most of what Mediclaim's neurology and urgent care clients see. This guide walks through the codes used most often, how to choose between a mononeuropathy and a polyneuropathy code, and where documentation gaps lead to denials. All codes below were verified against the FY2026 code set; remember that ICD-10-CM updates every October 1, so confirm any code against the set in effect on the date of service.
Start With the Question: One Nerve or Many?
The first coding decision is anatomical. A single compressed or injured nerve (carpal tunnel, ulnar neuropathy) is a mononeuropathy and lives in G56–G58. A diffuse, usually symmetric process affecting many nerves (diabetic "stocking-glove" neuropathy, toxic or drug-induced neuropathy) is a polyneuropathy and lives in G60–G64, or in the diabetes categories when diabetes is the cause. The clinician's note needs to make that distinction clear.
Polyneuropathy Codes: G60–G65
Hereditary, Idiopathic, and Inflammatory
G60.0 — Hereditary motor and sensory neuropathy (Charcot-Marie-Tooth)
G60.3 — Idiopathic progressive neuropathy
G60.9 — Hereditary and idiopathic neuropathy, unspecified
G61.0 — Guillain-Barré syndrome
G61.81 — Chronic inflammatory demyelinating polyneuritis (CIDP)
G61.82 — Multifocal motor neuropathy
Toxic, Drug-Induced, and Other Specified
G62.0 — Drug-induced polyneuropathy
G62.1 — Alcoholic polyneuropathy
G62.2 — Polyneuropathy due to other toxic agents
G62.81 — Critical illness polyneuropathy
G62.82 — Radiation-induced polyneuropathy
G62.89 — Other specified polyneuropathies
G62.9 — Polyneuropathy, unspecified
G63 — Polyneuropathy in diseases classified elsewhere (a manifestation code; the underlying disease is coded first, so it cannot be a first-listed diagnosis)
Drug-induced neuropathy needs a second code. For neuropathy caused by a medication taken as prescribed, such as certain chemotherapy agents, pair G62.0 with the appropriate adverse-effect code from the T36–T50 range, for example T45.1X5A (adverse effect of antineoplastic and immunosuppressive drugs, initial encounter). The chart has to link the neuropathy to the drug explicitly.
Action step: Search your neurology claims for G62.9 and G64-type "unspecified" neuropathy diagnoses. If the workup identified a cause, the note likely supports something more specific.
Diabetic Neuropathy: The Combination Codes
When a provider documents neuropathy in a patient with diabetes, ICD-10-CM presumes a link through the "with" convention unless the provider states the neuropathy is due to something else. That means the diabetes combination codes usually apply rather than a G-code.
E11.42 — Type 2 diabetes mellitus with diabetic polyneuropathy
E11.41 — Type 2 diabetes mellitus with diabetic mononeuropathy
E11.44 — Type 2 diabetes mellitus with diabetic amyotrophy
E10.42 / E10.41 / E10.44 — The same three conditions for type 1 diabetes
E13.42 — Other specified diabetes mellitus with diabetic polyneuropathy
Coding G62.9 alongside a diabetic patient's obvious diabetic polyneuropathy misses the combination code and can trigger a payer edit for a diagnosis that does not reflect the documented cause. Documentation of the diabetes type is essential; without it, coders cannot choose between the E10 and E11 families.
Mononeuropathies: Upper and Lower Limb
Most mononeuropathy codes require laterality, and payers increasingly reject claims that use the "unspecified limb" option when the note documents a side.
Upper Limb (G56)
G56.00 / G56.01 / G56.02 / G56.03 — Carpal tunnel syndrome, unspecified / right / left / bilateral upper limbs
G56.10–G56.13 — Other lesions of median nerve
G56.20–G56.23 — Lesion of ulnar nerve
G56.30–G56.33 — Lesion of radial nerve
G56.40–G56.43 — Causalgia of upper limb
Note that G56.0 on its own is a category header and is not valid for billing; the sixth-character laterality code is required.
Lower Limb (G57)
G57.00–G57.03 — Lesion of sciatic nerve
G57.10–G57.13 — Meralgia paresthetica
G57.20–G57.23 — Lesion of femoral nerve
G57.30–G57.33 — Lesion of lateral popliteal nerve
G57.50–G57.53 — Tarsal tunnel syndrome
G57.60–G57.63 — Lesion of plantar nerve (Morton's metatarsalgia territory)
G57.70–G57.73 — Causalgia of lower limb
Bilateral carpal tunnel is a good example of why this matters: G56.03 on one line is cleaner than billing G56.01 and G56.02 separately, and it should match the bilateral EMG/NCS being billed.
Symptom Codes: When the Diagnosis Isn't Established Yet
At urgent care, and at a neurologist's first visit, a patient may present with symptoms before any workup is done.
R20.0 — Anesthesia of skin
R20.1 — Hypoesthesia of skin
R20.2 — Paresthesia of skin
R20.3 — Hyperesthesia
R20.9 — Unspecified disturbances of skin sensation
Symptom codes are appropriate when no definitive diagnosis has been made. Once the provider documents "carpal tunnel syndrome" or "diabetic polyneuropathy," the symptom code should not continue to be billed for the same complaint, since it is integral to the diagnosis.
Where Neuropathy Claims Most Often Get Denied
1. EMG/NCS billed with a symptom code or "unspecified" diagnosis. Electrodiagnostic testing is a common medical necessity review target. A claim pairing nerve conduction studies with R20.2 or G62.9 alone gives the payer little to justify the number of nerves tested. The referring diagnosis should reflect the clinical question, such as suspected carpal tunnel or polyneuropathy.
2. Missing laterality. G56 and G57 codes require the side. "Carpal tunnel syndrome" documented without "right," "left," or "bilateral" forces an unspecified-limb code that some payers deny or downcode.
3. Diabetic neuropathy coded outside the diabetes category. A G-code where an E10/E11 combination code applies creates a mismatch with the rest of the claim, particularly when the patient's problem list already carries diabetes.
4. Drug-induced neuropathy without the adverse-effect code. G62.0 with no T-code, or with the wrong 7th character, leaves the cause unsupported.
5. Manifestation code billed as primary. G63 cannot stand alone. If it is first-listed, the claim will reject.
Action step: Review your last 90 days of EMG/NCS and neuropathy visit claims for three things: laterality on every G56/G57 code, diabetes combination codes on diabetic patients, and any use of G62.9 or R20.2 as the sole diagnosis for testing.
FAQ
What is the ICD-10 code for peripheral neuropathy?
There is no single code. Polyneuropathy is usually coded in G60–G64 (for example, G62.9 for unspecified polyneuropathy), and a single-nerve condition is coded in G50–G59. If the patient has diabetes and the neuropathy is documented, the E10/E11 combination codes such as E11.42 typically apply instead.
What is the ICD-10 code for carpal tunnel syndrome?
Carpal tunnel syndrome is coded with G56.00 (unspecified upper limb), G56.01 (right), G56.02 (left), or G56.03 (bilateral). The base code G56.0 is not billable on its own, so laterality must be documented.
Should diabetic neuropathy be coded with E11.42 or G63?
When diabetic polyneuropathy is documented in a patient with type 2 diabetes, E11.42 is the combination code. G63 is a manifestation code for polyneuropathy in other diseases classified elsewhere and cannot be listed first.
Can a symptom code like R20.2 be billed with an EMG?
It can be, particularly when no diagnosis has been established, but it is a weaker basis for medical necessity. Once the provider documents a definitive diagnosis, that code should replace the symptom code.
How does Mediclaim Services support neurology and urgent care neuropathy billing?
Mediclaim Services reviews diagnosis-to-procedure pairing for electrodiagnostic testing and neuropathy visits, checks laterality and combination coding before submission, and keeps practices current on annual ICD-10-CM changes so claims are paid the first time.
Coding Neuropathy With Precision
Neuropathy coding rewards a few habits: identify whether one nerve or many are involved, capture the cause when it is known, document laterality every time, and let symptom codes step aside once a diagnosis is made. Practices that build these into their templates see fewer medical necessity denials on nerve testing and fewer rejected claims overall.
At Mediclaim Services Inc., we manage medical billing for practices treating dental, EMS, neurology, and urgent care patients, including the neuropathy and electrodiagnostic claims that keep neurology practices busy. We use Tebra's billing platform to keep diagnosis coding, claim submission, and denial resolution running smoothly.
Contact Mediclaim Services to schedule a free billing audit
Ready for a closer look at your neuropathy and nerve-testing claims? Contact Mediclaim Services today for a free billing review.
