Unrelated E/M during postop

Orthopedic scenarios

Concrete situations in orthopedic practice that warrant modifier 24.

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

• A patient is 45 days into a 90-day global period following open reduction internal fixation (ORIF) of a distal radius fracture. At a scheduled office visit the patient reports chest palpitations. The surgeon evaluates and documents new-onset atrial fibrillation unrelated to the wrist fracture. Bill the appropriate E/M code with modifier 24 and an ICD-10 code for the arrhythmia.
• Twelve days after a total knee arthroplasty (TKA), the same operating surgeon sees the patient for evaluation of an acute URI with suspected pneumonia. The visit is clearly distinct from the knee surgery. Append modifier 24 to the E/M code with a respiratory diagnosis; do not use a postoperative care or aftercare code.
• A patient undergoes arthroscopic rotator cuff repair with a 90-day global period. On postoperative day 30, the same surgeon evaluates a new ankle sprain the patient sustained at home. The ankle injury is a separate anatomical site with an unrelated diagnosis—modifier 24 is appropriate here, and the claim should carry the ankle sprain ICD-10 code.
• During the 90-day global period of a lumbar spinal fusion, an orthopedic surgeon manages the patient's pre-existing Type 2 diabetes after a significant glycemic excursion. Because diabetes management is unrelated to the spinal procedure, modifier 24 applies to the E/M visit; document that no postoperative concerns were addressed during that encounter.
• A patient is eight days post-arthroscopic meniscectomy (10-day minor global period). The surgeon is asked to evaluate a contralateral knee with a suspected new meniscal tear. Because the contralateral knee injury is unrelated to the original procedure, the surgeon may bill an E/M with modifier 24 plus the appropriate new-injury diagnosis.

Common mistakes

Where coders most often go wrong with modifier 24.

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

• Using modifier 24 on the day of surgery instead of modifier 25—modifier 24 is only valid starting the day after the procedure date.
• Appending modifier 24 to procedure, lab, imaging, or supply codes—it is restricted to E/M and eye exam codes only.
• Submitting a wound-care, aftercare, or surgical-complication diagnosis alongside modifier 24—payers including Medicare treat these as related and will deny the claim.
• Assuming modifier 24 covers post-op management of surgical complications such as wound dehiscence or hardware irritation—those visits are bundled into the global package.
• Conflating modifier 24 with modifier 79; modifier 79 is for an unrelated surgical procedure during the global period, not for an E/M visit.
• Omitting a clearly distinct ICD-10 diagnosis code—supporting documentation must make the unrelated nature of the visit self-evident from the claim data alone.
• Applying modifier 24 outside the active global period—once the 10-day or 90-day window closes, the modifier is unnecessary and may trigger an audit flag.
• Using modifier 24 for the surgeon's admission of a patient to a skilled nursing facility when the admission reason is related to the surgery.

CPT codes that use modifier 24

727 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.
• 26556 $3,079.90
  Free toe joint transfer to the hand using microvascular anastomosis, replacing a finger joint destroyed by trauma or congenital deformity.
• 20802 $2,452.29
  Surgical reattachment of a completely severed arm, spanning from the surgical neck of the humerus through the elbow joint.
• 27076 $2,232.85
  Radical resection of a pelvic or hip tumor involving the ilium with acetabulum, both pubic rami, or the ischium with acetabulum — removing the tumor plus a margin of surrounding healthy bone and tissue.
• 22804 $2,222.50
  Posterior spinal arthrodesis for deformity correction spanning 13 or more vertebral segments, performed with or without application of a body cast.
• 21175 $1,931.91
  Bifrontal reconstruction of the superior-lateral orbital rims and lower forehead, with or without bone grafts including autograft harvest, for conditions such as plagiocephaly, trigonocephaly, or brachycephaly.
• 20697 $1,910.53
  Removal and replacement of a single strut in a multiplane unilateral external fixation system that uses stereotactic computer-assisted (spatial frame) adjustment, including imaging.
• 27365 $1,837.05
  Radical resection of a tumor involving the femur or knee, including bone and surrounding soft tissue as required for oncologic margins.
• 21268 $1,821.35
  Unilateral orbital repositioning via periorbital osteotomies with bone grafting to correct eye socket position from trauma or congenital deformity.
• 21436 $1,804.65
  Open treatment of a craniofacial separation fracture — the most complex category — requiring multiple internal fixation points and, when needed, bone grafting across the cranial-facial junction.
• 21461 $1,791.29
  Open surgical treatment of a mandibular fracture without interdental fixation — the fracture site is exposed and reduced through an open approach, but arch bars, wires, or other interdental fixation devices are not used to stabilize the repair.
• 22222 $1,774.26
  Anterior discectomy with osteotomy of a single thoracic vertebral segment, performed via an anterior approach.

Showing top 12 of 727 by total RVU.

Where modifier 24 shows up

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

• Foot & ankle 153 codes
• Wrist 89 codes
• Hand 83 codes
• Knee 83 codes