Endocrine, Nutritional and Metabolic Diseases

ICD-10 Code: E11.42

Type 2 Diabetes Mellitus with Diabetic Polyneuropathy

Type 2 diabetes mellitus with diabetic polyneuropathy represents bilateral, symmetric nerve damage affecting multiple peripheral nerves, typically manifesting in a glove-and-stocking distribution with sensory, motor, and autonomic symptoms caused by chronic hyperglycemia.

Clinical Information

Diabetic polyneuropathy, specifically distal symmetric polyneuropathy (DSPN), is the most common form of diabetic neuropathy, affecting 30-50% of patients with longstanding diabetes. It represents length-dependent nerve fiber damage beginning in the longest nerves (feet) and progressing proximally in a characteristic stocking-glove pattern. The pathophysiology involves multiple mechanisms: metabolic derangements (polyol pathway activation, advanced glycation end-products), vascular insufficiency to the vasa nervorum, oxidative stress, and inflammatory processes leading to axonal degeneration and demyelination. Small fiber involvement causes pain and autonomic dysfunction, while large fiber damage causes loss of vibration sense, proprioception, and motor weakness. Clinical presentation varies: some patients experience painful neuropathy with burning, shooting, or stabbing pain (often worse at night), while others have primarily sensory loss with numbness and loss of protective sensation. The latter group is at highest risk for foot ulceration and Charcot arthropathy. Motor involvement can cause foot deformities and gait disturbances. Autonomic involvement may manifest as gastroparesis, orthostatic hypotension, or genitourinary dysfunction.

Coding Guidelines

  • 1Use E11.42 specifically when documentation states 'polyneuropathy,' 'peripheral neuropathy,' or describes bilateral symmetric nerve involvement
  • 2Do not use E11.40 (unspecified neuropathy) if polyneuropathy is documented - E11.42 is more specific
  • 3Do not code separately for symptoms integral to polyneuropathy (paresthesias, hyperesthesia, foot pain) unless requiring separate treatment
  • 4If patient has both polyneuropathy and autonomic neuropathy, code both E11.42 and E11.43
  • 5For complications of polyneuropathy (foot ulcer, Charcot foot), code the complication with its specific code (E11.621 for foot ulcer)
  • 6Do not assume polyneuropathy from symptoms alone - provider must document causative link to diabetes

Common Uses

  • Neurology or podiatry referral for bilateral diabetic foot neuropathy
  • Office visit for painful diabetic peripheral neuropathy requiring medication management
  • Annual diabetic foot screening revealing loss of protective sensation with 10g monofilament
  • Prescription of gabapentin, pregabalin, or duloxetine for painful diabetic polyneuropathy
  • Physical therapy referral for gait instability due to proprioceptive loss from polyneuropathy
  • Documentation of polyneuropathy as comorbidity affecting surgical risk or recovery

Related ICD-10 Codes

E11.40Type 2 diabetes with diabetic neuropathy, unspecified (less specific)
E11.41Type 2 diabetes with diabetic mononeuropathy (single nerve)
E11.43Type 2 diabetes with diabetic autonomic neuropathy
E11.621Type 2 diabetes with foot ulcer (complication of neuropathy)
E11.610Type 2 diabetes with diabetic neuropathic arthropathy (Charcot foot)
G63Polyneuropathy in diseases classified elsewhere (do not code separately)

Documentation Requirements

  • Physician must document 'polyneuropathy,' 'peripheral neuropathy,' 'distal symmetric polyneuropathy (DSPN),' or 'sensorimotor polyneuropathy'
  • Document bilateral and symmetric nature of symptoms (both feet, both hands)
  • Describe sensory examination: 10g monofilament testing, vibration sense (128Hz tuning fork), pinprick, light touch, temperature
  • Document motor examination if weakness present: toe extension strength, foot dorsiflexion, ankle reflexes
  • Quantify symptom severity: pain scale, functional impact on ambulation and activities of daily living
  • Current treatment: neuropathic pain medications (gabapentin, pregabalin, duloxetine, tricyclics), foot care regimen, physical therapy

Real-World Coding Examples

65-year-old with 15-year history of type 2 diabetes presents with bilateral foot burning and numbness for 2 years. Neurological exam shows decreased sensation to monofilament in both feet, absent ankle reflexes, reduced vibration sense. Physician documents: 'diabetic peripheral polyneuropathy.' Diagnosis: Type 2 diabetes mellitus with diabetic polyneuropathy (E11.42). Started on pregabalin.

Patient admitted for cellulitis. History includes 'diabetic peripheral neuropathy with loss of protective sensation bilaterally.' Foot exam shows sensory loss in stocking distribution. Secondary diagnosis: E11.42.

Neurology consultation: 'Patient has distal symmetric polyneuropathy secondary to type 2 diabetes with sensory > motor involvement.' Nerve conduction studies show axonal polyneuropathy. Diagnosis: E11.42. Recommended duloxetine and diabetic shoes.

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Medical coding for Endocrine, Nutritional and Metabolic Diseases