Summary & Overview
CPT 26591: Repair of Intrinsic Muscles of the Hand
CPT code 26591 identifies repair of the intrinsic muscles of the hand — a surgical procedure addressing thenar, hypothenar, interossei, and lumbrical muscle injuries or defects. This code captures a focused reconstructive or reparative hand surgery procedure that can affect hand function, dexterity, and patient quality of life; it is used in billing for operative management of intrinsic muscle trauma, laceration, or degenerative disruption. Nationally, accurate coding for such procedures supports proper reimbursement, clinical tracking of hand surgery volumes, and quality monitoring of functional outcomes.
Key payers commonly referenced for reimbursement and coverage comparisons include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the procedure, typical sites of service, and the common modifiers associated with surgical services (provided separately). The publication presents benchmarks and payer coverage patterns, highlights coding caveats relevant to hand surgery billing, and summarizes policy considerations affecting payment and claims adjudication for operative hand procedures.
The content is intended for billing managers, hand surgeons, coding professionals, and policy analysts seeking a national overview of CPT code 26591, its clinical scope, and the payer landscape relevant to hand muscle repair.
Billing Code Overview
CPT code 26591 describes surgical repair of the intrinsic muscles of the hand, including the thenar (thumb) muscles, hypothenar (little finger) muscles, interossei muscles originating from the metacarpal bones, and the lumbrical muscles originating from the finger and hand tendons.
Service type: Surgical repair of hand intrinsic musculature.
Typical site of service: Hospital operating room or ambulatory surgery center for operative management of hand muscle injuries or defects. If performed in a less acute setting, procedures may occur in outpatient surgical suites staffed for hand surgery.
Clinical & Coding Specifications
Clinical Context
A 32-year-old right-hand dominant mechanic presents after sustaining a deep laceration to the palmar aspect of the left hand from a workplace accident. On examination there is loss of intrinsic muscle function with weakness of thumb opposition and impaired finger abduction/adduction. Preoperative evaluation includes neurovascular exam, radiographs to exclude fracture, and discussion of risks/benefits. The patient is consented for operative repair of the intrinsic hand musculature under regional block or general anesthesia. Intraoperatively the surgeon explores the wound, identifies injured thenar and interossei muscle bellies and tendon origins, debrides devitalized tissue, and performs layered repair of the intrinsic muscles with fine, nonabsorbable sutures. Hemostasis is obtained, wounds closed, and a dorsal splint applied with the hand in a functional position. Postoperative workflow includes immediate postoperative neurovascular check, pain control, wound care instructions, and early referral to hand therapy for edema control and gradual mobilization to preserve range of motion and restore fine motor function. Follow-up visits assess wound healing, suture removal, and progressive rehabilitation milestones.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the repair required substantially greater effort, complexity, or operative time than typical for 26591. |