Staged or related procedure

Orthopedic scenarios

Concrete situations in orthopedic practice that warrant modifier 58.

Source · Editorial brief grounded in AAOS coding guidance and cited references ↓

• Staged bilateral total knee arthroplasty (TKA): the surgeon performs a right TKA (CPT 27447) and documents at that time that the left TKA is planned within 90 days. When the left TKA is performed during the right TKA's global period, bill 27447-58. A new 90-day global period begins on the date of the left TKA.
• Diagnostic arthroscopy leading to open procedure: a diagnostic shoulder arthroscopy (CPT 29805) is performed to evaluate labral pathology; findings confirm the need for an open Latarjet procedure (CPT 23462) scheduled one week later. Bill 23462-58 to indicate the open procedure was a planned escalation from the diagnostic arthroscopy.
• Staged ORIF after external fixation: a high-energy tibial plateau fracture is initially stabilized with a spanning external fixator (CPT 20690). Ten days later, once swelling subsides, the same surgeon performs definitive open reduction and internal fixation (CPT 27536). Bill 27536-58; the staged conversion was planned at the time of fixator placement.
• Two-stage ACL reconstruction with allograft: the surgeon performs an initial tunnel bone-grafting procedure to correct prior tunnel malposition; the ACL graft placement (CPT 29888) is scheduled for 6–8 weeks later once graft incorporation is confirmed. Bill 29888-58 for the second stage.
• Planned hardware removal after ORIF: following distal radius ORIF (CPT 25600 or 25607), the surgeon documents at the original surgery that hardware removal (CPT 20680) is anticipated at 12 months. If removal occurs during the global period and was explicitly pre-planned, bill 20680-58.

Common mistakes

Where coders most often go wrong with modifier 58.

Source · Editorial brief grounded in CMS NCCI Policy Manual and cited references ↓

• Appending modifier 58 instead of modifier 78 when the return to the OR was triggered by an unexpected complication of the original surgery—modifier 78 is the correct choice for unplanned, complication-driven returns.
• Using modifier 58 on ASC facility fee claims; the modifier is valid only on professional fee (physician) claims, not on the ambulatory surgical center facility line.
• Attaching modifier 58 to a procedure whose CPT code description already specifies 'one or more sessions' or 'one or more visits'—the staged nature is already built into the code and the modifier creates a duplicate-service flag.
• Applying modifier 58 to codes with a global period indicator of XXX; those codes carry no global period, so the modifier has no procedural or billing effect and will likely trigger an edit.
• Failing to confirm that the same provider (or same group/practice, per payer rules) performed both procedures—modifier 58 requires the staged work be by the same physician or other qualified health care professional.
• Confusing modifier 58 with modifier 79: if the second surgery is entirely unrelated to the first (e.g., a new acute injury during an existing global period), modifier 79 is correct, not modifier 58.
• Omitting supporting documentation that explicitly describes the procedure as staged or planned; without it, payers often downcode to a complication scenario and reimburse at the reduced modifier-78 rate.
• Appending modifier 58 to assistant-at-surgery claims; staged-procedure logic does not extend to assistant surgeon billing lines.

CPT codes that use modifier 58

1,094 orthopedic CPT codes in our reference list this modifier as applicable. Sorted by total RVU.

Source · Derived from per-code modifier guidance in our CPT reference

• 27278 $13,754.82
  Percutaneous arthrodesis of the sacroiliac joint performed under image guidance, with placement of intra-articular implant(s) — such as bone allograft or a synthetic device — without transfixing the joint.
• 21215 $4,120.00
  Bone graft to the mandible, including harvest of the graft from a donor site by the operating surgeon.
• 21127 $3,968.03
  Augmentation of the mandible using a bone graft, typically to build up deficient jaw volume for reconstructive purposes.
• 26556 $3,079.90
  Free toe joint transfer to the hand using microvascular anastomosis, replacing a finger joint destroyed by trauma or congenital deformity.
• 26553 $2,954.98
  Toe-to-hand transfer with microvascular anastomosis, single digit other than the great toe
• 20805 $2,899.20
  Complete replantation of a traumatically amputated forearm, reattaching bone, vessels, nerves, and soft tissue.
• 20973 $2,670.40
  Free osteocutaneous flap harvested from the great toe with web space, transferred to a recipient site using microvascular anastomosis to restore both bone and soft tissue.
• 20972 $2,531.79
  Free osteocutaneous flap transfer from a metatarsal donor site, with microvascular anastomosis, to reconstruct a recipient site requiring both bone and skin coverage.
• 20838 $2,494.05
  Surgical reattachment of a completely amputated foot, restoring bony, vascular, tendinous, and neural continuity.
• 27077 $2,483.02
  Radical resection of a tumor or infection involving the total innominate bone (ilium, ischium, and pubis as a composite structure), with wide excision margins extending into surrounding healthy tissue.
• 20802 $2,452.29
  Surgical reattachment of a completely severed arm, spanning from the surgical neck of the humerus through the elbow joint.
• 21160 $2,392.84
  Reconstruction of the midface (Le Fort III level) with advancement using an internal distraction device — a high-complexity craniofacial procedure performed for severe midface hypoplasia or retrusion.

Showing top 12 of 1,094 by total RVU.

Where modifier 58 shows up

Body regions where this modifier most commonly appears in our orthopedic reference.

• Foot & ankle 249 codes
• Other 133 codes
• Hand 128 codes
• Knee 119 codes