C1608 Prosthesis (HCPCS) Reimbursement & Policy

HCPCS Level II code C1608 designates an implantable total dual-mobility prosthesis for the first carpometacarpal joint (the thumb base). It matters nationally as the aging population and demand for hand and thumb reconstructive procedures grow; a specific HCPCS Level II code supports consistent reporting, billing, and tracking of device utilization and payments across payers. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will learn what the code represents clinically, the typical settings where the device is implanted, and what to expect in a national policy and billing context. The publication summarizes benchmarks and coverage trends where available, clarifies coding placement within the HCPCS Level II system, and provides clinical context for the prosthesis’ use in first carpometacarpal total joint replacement. Where payer-specific coverage policies and reimbursement benchmarks are available, they are summarized to aid billing compliance and claims preparation. Data not available in the input is noted explicitly where applicable.

Billing Code Overview

HCPCS Level II code C1608 describes a prosthesis, total, dual mobility, first carpometacarpal joint (implantable). This code represents an implantable orthopedic prosthesis designed for total joint replacement of the first carpometacarpal (thumb base) joint using a dual mobility construct.

Service Type: Orthopedic implant/prosthesis – total joint replacement

Typical Site of Service: Hospital operating room or outpatient surgical center

Data not available in the input.

Clinical Context

A typical patient is a 65-year-old right-hand-dominant individual with progressive pain, reduced grip strength, and thumb base instability from advanced osteoarthritis of the first carpometacarpal (CMC) joint. Conservative care (activity modification, splinting, NSAIDs, corticosteroid injection) failed to provide durable relief. After surgical evaluation, the patient is scheduled for implantation of a total dual mobility prosthesis for the first carpometacarpal joint (C1608). The procedure is performed in an outpatient ambulatory surgery center or hospital outpatient department with regional or general anesthesia. Preoperative workflow includes history and physical, imaging (radiographs +/- CT), informed consent, medication reconciliation, and prophylactic antibiotics. Intraoperative workflow includes surgical exposure of the first CMC joint, preparation of trapezium and metacarpal surfaces, implantation of the dual mobility components, assessment of stability and range of motion, and wound closure. Postoperative workflow includes immediate recovery, analgesia plan, immobilization in a short thumb spica splint or cast, discharge instructions, and scheduled follow-up for wound check and progressive hand therapy focusing on range of motion and strengthening. Typical payors include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, and Medicare; billing reflects implantable device reporting for device tracking and reimbursement under C1608 for the prosthetic implant itself, with separate reporting for surgeon services and facility charges.

Coding Specifications

Modifier	Description	When to Use

Taxonomy Code	Specialty	Notes
`207XS0106X`	Hand Surgery	Surgeons with focus on operative management of hand and wrist, commonly perform first CMC arthroplasty and implant procedures.
`207K00000X`	Orthopaedic Surgery	Orthopaedic surgeons who manage degenerative and traumatic conditions of the thumb and perform prosthetic reconstruction.
`207R00000X`	Plastic Surgery	Plastic and reconstructive surgeons with hand surgery expertise may perform implant arthroplasty of the thumb.
`363L00000X`	Physical Medicine & Rehabilitation	Physiatrists may coordinate pre- and postoperative rehabilitation and nonoperative management.
`163WL0500X`	Anesthesiology	Anesthesiologists providing regional block or general anesthesia for the procedure.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M18.0`	Primary osteoarthritis of first carpometacarpal joint, bilateral	Common indication for total dual mobility first CMC joint prosthesis when conservative care fails.
`M18.11`	Primary osteoarthritis of right first carpometacarpal joint	Indicates right-thumb CMC joint osteoarthritis as a localized diagnosis supporting the procedure.
`M18.12`	Primary osteoarthritis of left first carpometacarpal joint	Indicates left-thumb CMC joint osteoarthritis as a localized diagnosis supporting the procedure.
`M18.9`	Osteoarthritis of first carpometacarpal joint, unspecified	Used when laterality is not specified but clinical documentation supports CMC joint arthroplasty.
`M19.011`	Post-traumatic osteoarthritis, right first carpometacarpal joint	Post-traumatic degenerative change leading to pain and dysfunction; may necessitate prosthetic joint replacement.
`M19.012`	Post-traumatic osteoarthritis, left first carpometacarpal joint	As above for the left side.
`S63.50XA`	Sprain of carpometacarpal joint of unspecified thumb, initial encounter	Acute or chronic instability after injury that may ultimately require reconstructive procedures including arthroplasty.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`25110`	Arthroplasty, trapezium-metacarpal joint, with implant (eg, thumb CMC joint)	Primary surgeon procedure code for total implant arthroplasty of the first CMC joint; often reported for the operative service when using a coded CPT for implant placement.
`20670`	Removal of implant; deep (eg, buried)	Reported if removal of a previously placed CMC implant is required prior to implantation of `C1608` or for revision.
`99070`	Supplies and materials (eg, sutures, drugs) (List separately in addition to code for service)	Used by facilities to bill for non-implant supplies not included in the global procedure; facility-specific reporting may vary.
`76000`	Fluoroscopic guidance (eg, for localization)	Used if intraoperative fluoroscopy is documented and billed separately to assist implant positioning.
`97001`	Physical therapy evaluation	Used for postoperative hand therapy evaluation; reported by therapy providers involved in rehabilitation after implantation.
`97002`	Physical therapy re-evaluation	Used for subsequent therapy re-evaluations during postoperative course.

OpenPayer

Summary & Overview

HCPCS C1608: Prosthesis, Total Dual Mobility, First Carpometacarpal Joint