Summary & Overview
CPT 0335T: Synthetic Implant for Foot Hyperpronation
CPT code 0335T identifies a surgical procedure that implants a synthetic device in the soft tissues between the ankle and heel bones to treat hyperpronation of the foot. As a specific, procedure-level code, it captures a targeted biomechanical intervention used to address symptomatic overpronation that may contribute to pain, instability, or progressive deformity. Nationally, precise coding for emerging or specialized foot procedures affects claims adjudication, coverage determinations, and tracking of utilization trends.
Key payers addressed in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical intent of the procedure, typical sites of service, and which major payers are relevant to coverage and reimbursement considerations. The report summarizes available benchmarks and common payer approaches where present, notes whether policy-level guidance exists, and provides clinical context linking the procedure to indications and postoperative considerations.
This summary equips billing managers, coding professionals, and policy analysts with a clear, national-level reference for CPT code 0335T, highlighting where to focus further review for payer-specific medical necessity criteria, prior authorization requirements, and documentation best practices. Data not available in the input is identified where applicable.
Billing Code Overview
CPT code 0335T describes a surgical procedure in which a provider attaches a synthetic implant to the soft tissues between the ankle and heel bones to treat hyperpronation of the foot. The procedure is a form of soft-tissue implant insertion intended to correct abnormal foot biomechanics caused by excessive pronation.
Service Type: Surgical implant procedure to correct foot hyperpronation
Typical Site of Service: Ambulatory surgical center or hospital operating room, with potential for same-day discharge depending on clinical course and setting.
Clinical & Coding Specifications
Clinical Context
A typical patient is an otherwise healthy adolescent or adult presenting with symptomatic flexible hindfoot hyperpronation (excessive subtalar joint eversion) causing persistent medial arch collapse, peroneal tendon overload, posterior tibial tendon dysfunction, or lateral ankle instability despite conservative care. Conservative management includes activity modification, physical therapy focused on intrinsic and extrinsic foot muscle strengthening, custom orthotics, temporary immobilization, NSAIDs, and corticosteroid injections when indicated. After 6–12 months of failed nonoperative measures and persistent functional impairment or pain, the foot and ankle surgeon discusses surgical options including insertion of a subtalar interpositional synthetic implant to limit excessive pronation.
Preoperative evaluation includes weight-bearing radiographs of the foot and ankle and a clinical exam documenting hindfoot alignment, range of motion, and stability. The procedure is performed under regional or general anesthesia in an ambulatory surgery center or hospital operating room. The surgeon places a synthetic implant into the sinus tarsi or soft tissues between the talus (ankle bone) and calcaneus (heel bone) to restrict excessive subtalar motion. Typical perioperative workflow includes time-out, prophylactic antibiotics, intraoperative fluoroscopy to confirm position, wound closure, dressing and splinting, and post-anesthesia recovery. Postoperative management includes immobilization in a splint or boot, partial weight-bearing as directed, routine wound checks, and progressive rehabilitation. Expected outcomes include improved hindfoot alignment and reduced symptoms; potential complications include implant malposition, persistent pain, infection, implant removal, or adjacent-joint arthritis.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work required to perform the procedure is substantially greater than typically required. |
23 | Unusual anesthesia | Use when procedure performed under general anesthesia due to patient condition when local/regional would be typical. |
51 | Multiple procedures | Use when other distinct procedures are billed same day in addition to this procedure. |
52 | Reduced services | Use when procedure is partially reduced or not completed as originally planned. |
53 | Discontinued procedure | Use when procedure is started but stopped due to extenuating circumstances. |
62 | Two surgeons | Use when two surgeons work together as primary surgeons performing distinct parts of the procedure. |
66 | Surgical team approach | Use when a qualified surgical team performs this complex procedure per payer rules. |
78 | Unplanned return to OR | Use for the immediate postoperative return to the operating room for related procedure during the global period. |
80 | Assistant surgeon | Use when a qualified assistant surgeon provides assistance at surgery. |
82 | Assistant with inadequate documentation | Use when assistant required but may not meet usual assistant surgeon qualifications. |
LT | Left side | Use to indicate the procedure was performed on the left foot. |
RT | Right side | Use to indicate the procedure was performed on the right foot. |
QK | Medical direction by a physician: more than 4 concurrent anesthesia cases | Relevant when physician-directed anesthesia services meet this specific scenario. |
QX | CRNA service with physician absent, state allowed | Use when a CRNA provides anesthesia without physician present and payor allows billing. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 207Y00000X | Podiatric Medicine & Surgery | Podiatrists commonly perform hindfoot implant procedures. |
| 207L00000X | Orthopedic Surgery | Foot and ankle orthopedic surgeons perform implant placement for subtalar stabilization. |
| 2080P0002X | Physical Medicine & Rehabilitation | PM&R physicians manage perioperative and postoperative rehabilitation and nonoperative care. |
| 208800000X | Family Medicine | May provide initial conservative management and preoperative optimization referrals. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
M21.66 | Other acquired deformity of right ankle and foot | May describe acquired hindfoot deformity including pronation-related changes on the right. |
M21.67 | Other acquired deformity of left ankle and foot | May describe acquired hindfoot deformity including pronation-related changes on the left. |
M21.1 | Pes planus (acquired) | Flexible flatfoot is commonly associated with symptomatic hyperpronation treated with subtalar implant. |
M76.8 | Other enthesopathy of lower limb | Associated tendinopathy (e.g., posterior tibial tendon dysfunction) related to hyperpronation. |
M77.9 | Enthesopathy, unspecified | Represents related soft-tissue overload conditions that may accompany hyperpronation. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
0263T | Injection, anesthetic agent, ankle/foot for pain management (example) | Performed preoperatively for diagnostic or therapeutic ankle/foot analgesia; may be part of conservative management prior to surgery. |
28820 | Arthroereisis, subtalar joint, implant (sinus tarsi) | A commonly used code for subtalar implant procedures involving sinus tarsi implants; may be an alternative or related technique to 0335T. |
29882 | Arthroscopy, ankle, surgical; with debridement/shaving of articular cartilage (chondroplasty) | Performed when concomitant intra-articular pathology requires arthroscopic treatment at time of implant placement. |
20610 | Arthrocentesis, aspiration and/or injection, major joint or bursa | May be used preoperatively for diagnostic or therapeutic injections in the hindfoot/ankle region. |
28899 | Unlisted procedure, foot or toes | Used for variant or novel soft-tissue implant procedures when no specific CPT exists; may be used if payer requires an unlisted code instead of a T-code. |