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    v1.0.31
    OpenPayerBilling CodesTemporary National Codes (Non-Medicare)HCPCS hcpcs-s2115-periacetabular-osteotomy-internal-fixation
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    HCPCS S2115: Periacetabular Osteotomy with Internal Fixation

    HCPCS Level II code S2115 describes a surgical procedure for periacetabular osteotomy with internal fixation, a pelvic/hip surgery to reorient the acetabulum and stabilize it with implants; the service is an orthopedic pelvic/hip reconstructive procedure typically performed in an inpatient or ambulatory surgical center (hospital or ASC) setting.

    For related coverage guidance, see recent payer policy updates: Medical Necessity Guidelines Non-Emergency Transportation, Non-Emergent Transportation Medical Policy, Non-Emergency Facility to Facility Transfers.

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A 24-year-old patient with symptomatic acetabular dysplasia presents with persistent lateral hip pain, early osteoarthritis changes on imaging, and hip instability despite conservative care (physical therapy, activity modification, and NSAIDs). Orthopedic evaluation includes pelvic radiographs and CT to assess acetabular orientation and femoral head coverage. After multidisciplinary discussion, the patient is scheduled for a periacetabular osteotomy with internal fixation (S2115) to reorient the acetabulum, improve femoral head coverage, and reduce joint contact pressures.

    Preoperative workflow includes history and physical, medical clearance, templating of osteotomy cuts, and planning fixation (plates/screws). The procedure is performed in an operating room under general anesthesia with fluoroscopic guidance. Postoperative care includes inpatient pain control, thromboprophylaxis, weightbearing restrictions, wound checks, and outpatient physical therapy for gait training and hip strengthening. Follow-up radiographs confirm osteotomy position and hardware placement; staged hardware removal may occur months to years later if symptomatic.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    27146Osteotomy, iliac or innominate bone, for congenital or acquired deformity (separate procedure)May be performed in conjunction with pelvic reorientation or as an alternative osteotomy of the pelvis when addressing acetabular coverage.
    27299Unlisted procedure, pelvis or hip jointUsed for pelvic/hip procedures not described by specific CPT codes; occasionally used for atypical or novel osteotomy techniques when no specific CPT exists.
    20690Application, fixation, and/or insertion of internal fixation device (separate procedure code varies by device)Codes for fixation hardware placement (plates/screws) used to stabilize the periacetabular osteotomy; specific fixation codes may vary.
    73600Radiologic examination, lower extremity, single view, hip, with or without pelvisPreoperative and postoperative radiographs to plan and confirm osteotomy position.
    77002Fluoroscopic guidance for needle placement (diagnostic or therapeutic) — Note: fluoroscopy guidance during surgery is typically included in the operative code; separate billing varies by payerFluoroscopy is used intraoperatively to guide osteotomy cuts and hardware placement; separate billing requires payer rules compliance.

    Related Modifiers

    15 rows

    ModifierDescriptionWhen to Use
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    50Modifier –50 (Bilateral Procedure) is appended to a CPT code when an identical procedure is performed on paired anatomical structures during the same operative session. The AMA states to add…- Use modifier -50 when the same CPT surgical, diagnostic, or radiology procedure is performed on paired anatomical structures (both sides of the body) during the same operative/session by the same…
    51Modifier –51 (Multiple Procedures) is used when the same provider performs multiple procedures in the same session to identify secondary, non‑exempt procedures and indicate payment reduction logic…- Use modifier -51 when the same provider performs multiple distinct procedures during the same patient encounter: report the highest‑valued procedure first (no modifier) and append -51 to…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    54Modifier ‑54 (“Surgical care only”) is appended to a CPT surgical procedure when the reporting surgeon performs the intraoperative (surgical) component but does not furnish the preoperative and/or…- Use modifier -54 when the reporting surgeon provided only the intraoperative (surgical) component of a procedure and preoperative and/or postoperative management has been or will be provided by…
    55Modifier –55 indicates the billing provider furnished only postoperative management for a procedure that has a global surgical period. According to AAPC, this modifier is appended to the same CPT…- Use modifier -55 when billing the same CPT surgical code that has a 10- or 90-day global period and you, as a provider other than the original surgeon, furnished ONLY postoperative management (no…
    58Modifier 58 (Staged or related procedure/service by the same physician during the postoperative period) indicates that a subsequent procedure performed by the same provider during the…- Use modifier 58 when the same physician/QHP performs a procedure during the postoperative/global period of an earlier procedure and the subsequent procedure is either planned or anticipated…
    59Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…

    Showing 1–10 of 15

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207L00000X
    207K00000X
    2080P0207X
    208800000X
    342000000X
    332BN1400X
    163WP2201X
    3336S0011X

    Related ICD-10-CM Codes

    19 rows

    ICD-10-CM CodeDescription
    M16.11Unilateral primary osteoarthritis, right hip
    M16.12Unilateral primary osteoarthritis, left hip
    M16.9Osteoarthritis of hip, unspecified
    M24.251Disorder of ligament, right hip
    M24.252Disorder of ligament, left hip
    M25.551Pain in right hip
    M25.552Pain in left hip
    M25.859Other specified joint disorders, unspecified hip
    M84.451APathological fracture, right femur, initial encounter for fracture
    M84.451DPathological fracture, right femur, subsequent encounter for fracture with routine healing

    Showing 1–10 of 19

    Related Payer Policy Updates

    Specialty: Emergency & Medical Transportation1 / 3

    10 rows

    PolicyPayerEffective Date
    Medical Necessity Guidelines Non-Emergency TransportationMass General Brigham Health Plan2026-11-01
    Non-Emergent Transportation Medical PolicyHealth-New-England2026-11-01
    Non-Emergency Facility to Facility Transfershap_caresource_mi_coordinated_health2026-11-01
    Ambulance and Medical Transport Services (Ground, Air and Water) Corporate Medical Policybcbsvermont2026-10-01
    Emergency Air/Water Ambulance Services Medical GuidelineWPS Health Insurance2026-10-01
    Non-Emergent Ambulance ServicesConnectiCare2026-09-11
    Fixed Wing Air Ambulance TransportCigna2026-08-15
    Air AmbulanceAmbetter Georgia2026-08-01
    Ambulance Services (for Tennessee Only)UnitedHealthcare2026-08-01
    Ambulance Services (for New Mexico Only)UnitedHealthcare2026-08-01

    Related Codes

    HCPCS-LEVEL-II-S2152-SOLID-ORGAN-TRANSPLANTATION-GLOBAL-CARE

    HCPCS Level II S2152: Solid Organ Procurement and Transplantation

    HCPCS-LEVEL-II-S2266-INDUCED-ABORTION-29-TO-31-WEEKS

    HCPCS Level II S2266: Induced Abortion, 29 to 31 Weeks

    HCPCS-LEVEL-II-S3630-EOSINOPHIL-COUNT-BLOOD-DIRECT

    HCPCS Level II S3630: Eosinophil Count, Blood, Direct

    HCPCS-LEVEL-II-S4017-INCOMPLETE-ART-CYCLE-CANCELLED-PRIOR-TO-STIMULATION

    HCPCS Level II S4017: Incomplete Cycle — Cancelled Prior to Stimulation

    HCPCS-LEVEL-II-S8055-ULTRASOUND-GUIDANCE-MULTIFETAL-REDUCTION-TC

    HCPCS Level II S8055: Ultrasound Guidance for Multifetal Pregnancy Reduction

    HCPCS-LEVEL-II-S8940-EQUESTRIAN-HIPPOTHERAPY-PER-SESSION

    HCPCS Level II S8940: Equestrian/Hippotherapy, Per Session

    HCPCS-LEVEL-II-S9024-PARANASAL-SINUS-ULTRASOUND

    HCPCS Level II S9024: Paranasal Sinus Ultrasound

    HCPCS-LEVEL-II-S9366-HOME-TPN-1-2L-PER-DAY-HOME-INFUSION

    HCPCS Level II S9366: Home Infusion TPN, 1–2 L/day

    HCPCS-LEVEL-II-S9446-GROUP-PATIENT-EDUCATION-NON-PHYSICIAN

    HCPCS S9446: Patient Education, Non-Physician Provider, Group, Per Session

    HCPCS-LEVEL-II-S9451-EXERCISE-CLASS-NON-PHYSICIAN-SESSION

    HCPCS S9451: Exercise Classes, Non-Physician Provider, Per Session

    Showing 1–10 of 532

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    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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