Key Takeaways
- Joint injections and aspirations bill by joint size, and the ultrasound-guided versions (20604, 20606, 20611) include the guidance.
- Hyaluronic acid injections bill as the injection plus the product’s own J-code, and payers limit them by joint and by how often they can be repeated.
- Fracture care is a global package, and when the initial treatment and follow-up are split between physicians, modifiers 54 and 55 divide it.
- Self-administered biologics such as adalimumab are excluded from Medicare Part B, while infused biologics are billed as the drug plus an administration code.
- Practices that dispense braces and boots need DMEPOS supplier enrollment to bill those items to Medicare.
Joint Injections and Aspirations
Arthrocentesis and joint injection codes are chosen by the size of the joint and whether ultrasound guidance was used. Without ultrasound, a small joint such as a finger bills as 20600, an intermediate joint such as a wrist or elbow as 20605, and a major joint such as a knee or shoulder as 20610. With ultrasound guidance, those become 20604, 20606, and 20611, which include the guidance and a permanent recorded image. Billing 76942 with any of them is unbundling.
Bilateral knee injections bill with modifier 50, and injections into different joints at the same session take RT, LT, or a distinct-procedure modifier such as modifier 59 or the X modifiers, depending on the payer. The steroid bills separately with its J-code and units.
Hyaluronic acid injections bill as 20610 or 20611 plus the product’s specific J-code, since each brand has its own code and dose. Medicare and most commercial plans cover them for knee osteoarthritis only after conservative treatment, and they limit how often a course can be repeated. Some plans no longer cover them at all, so benefits should be checked before ordering the product. Platelet-rich plasma injections bill under a Category III code and are rarely covered.
Office Visits and Modifier 25
An office visit on the same day as an injection is billable only when it goes beyond the routine decision to inject. Examining the knee before injecting it is part of the injection. Evaluating a new complaint, adjusting a rheumatologist’s DMARD regimen, or working up a different joint supports a separate E/M with modifier 25. Payers audit modifier 25 on injection days closely in both specialties, and our guide to using modifier 25 correctly covers the documentation that holds up.
Orthopedic Surgery and Global Periods
Knee arthroscopy codes are chosen by what was done, such as 29880 or 29881 for meniscectomy, and some smaller procedures in the same compartment, such as chondroplasty, are bundled into the larger one. Shoulder arthroscopy follows the same logic, with rotator cuff repair (29827) as a primary code and several add-on procedures that Medicare bundles or limits. Total knee (27447) and total hip (27130) arthroplasty are no longer on Medicare’s inpatient-only list, so many are now done as outpatient or ASC cases, which changes facility billing but not the surgeon’s code.
Most of these procedures carry a 90-day global period. The decision-for-surgery visit takes modifier 57, unrelated visits during the global take modifier 24, a return to the operating room for a complication takes modifier 78, and an unrelated procedure takes modifier 79. Our general surgery page covers global surgery rules in more detail.
In a hospital or surgery center, implants and hardware are billed by the facility. The surgeon bills only the professional service.
Fracture Care
Fracture treatment codes are global packages that include the initial treatment, the first cast or splint, and routine follow-up during healing. Most carry a 90-day global. X-rays, replacement casts, and casting supplies are billed separately. Supplies bill under Q-codes such as Q4001 to Q4051 for cast and splint materials.
When an emergency physician or another practice provides the initial treatment and the orthopedist provides follow-up care, the package is split. The physician who treated the fracture bills with modifier 54 for the surgical care only, and the orthopedist bills with modifier 55 for postoperative management. When the orthopedist sees the patient for the first time after the fracture has already been treated, the visit is often billed as an E/M instead, depending on the work done.
Rheumatology and Biologic Infusions
Rheumatology revenue depends heavily on infused and injected biologics. Infliximab (J1745), rituximab, tocilizumab, and abatacept infusions bill as the drug, with units from the HCPCS dosage descriptor, plus an administration code. Many of these qualify for the complex drug administration codes (96413 and 96415) instead of the standard infusion codes, based on the monitoring they require. Medicare requires the JW modifier for discarded drug from single-dose vials and JZ when nothing was discarded.
Self-administered biologics are different. Adalimumab, etanercept, and similar drugs that patients inject at home are on Medicare’s self-administered drug exclusion lists and are covered under Part D or the pharmacy benefit, not billed by the practice. Our biologics and specialty drugs page covers units, NDCs, and waste modifiers in detail.
Rheumatology practices also bill bone density scans (77080), in-office joint ultrasound, and regular E/M visits to monitor disease activity and drug toxicity. Visits managing a drug that needs lab monitoring for toxicity often support a higher level of decision-making.
Prior Authorization
MRI and CT, elective joint replacement, spine surgery, and nearly every biologic need prior authorization. Biologic approvals usually require documented failure of conventional DMARDs such as methotrexate, disease activity measures, and lab results, and many plans now require a preferred biosimilar first. Surgical approvals usually require imaging and a documented course of conservative care, such as physical therapy and injections.
Authorizations expire and have to match what’s billed. A switch from one biologic to another, a dose change, or a different surgical approach needs a new approval. When the approval doesn’t match the claim, it can deny, which we cover in why an approved authorization can still end in a denied claim.
Braces, Boots, and DME
Many orthopedic practices dispense walking boots, knee braces, wrist splints, and other orthoses from the office. These bill under HCPCS L-codes, and Medicare requires the practice to be enrolled as a DMEPOS supplier to bill them. Physicians are exempt from DMEPOS accreditation, but the enrollment and supplier standards still apply. Documentation needs the order, medical necessity, and proof the patient received and was fitted with the item. Our DME page covers supplier enrollment.
Orthopedic and Rheumatology Credentialing
Board certification
Board certificationOrthopedic surgeons certify through the American Board of Orthopaedic Surgery, with subspecialty certifications available in sports medicine and hand surgery. Rheumatologists certify in internal medicine and then in rheumatology through the American Board of Internal Medicine, and pediatric rheumatologists through the American Board of Pediatrics. Payers verify both the primary and subspecialty certifications, licensure, DEA registration, and malpractice history.
Hospital and surgery center privileges
Orthopedic surgeons usually operate at more than one hospital and ambulatory surgery center, and each one grants privileges separately, often procedure by procedure. A surgeon who isn’t privileged for a procedure at a facility can’t perform or bill it there.
NPs, PAs, and recredentialing
Physician assistants often assist in surgery and run postoperative and injection clinics. Each needs their own payer enrollment, and an assisting PA bills with modifier AS. Most payers recredential every three years, and a provider who lapses can’t bill that plan until reinstated, which is why you can’t bill what you can’t credential.
Payer Contracting
Orthopedic and rheumatology groups should compare each payer’s rates for their highest-volume codes, which usually means injections, arthroscopy, fracture care, and joint replacement for orthopedics, and infusion administration and biologic drug payment for rheumatology. Drug payment rates that fall below acquisition cost turn buy-and-bill into a loss, so rheumatology contracts should be checked drug by drug. Our guide to negotiating payer contracts covers the process.
Orthopedic and Rheumatology Billing FAQ
Can ultrasound guidance be billed with a knee injection?
Not separately. An ultrasound-guided major joint injection bills as 20611, which includes the guidance. Billing 76942 with it is unbundling.
How are bilateral knee injections billed?
With 20610 or 20611 and modifier 50, plus the drug’s J-code and units.
How is fracture care billed when another physician did the initial treatment?
The global package is split. The physician who treated the fracture bills with modifier 54, and the physician providing follow-up bills with modifier 55.
Does Medicare Part B cover Humira?
No. Adalimumab is self-administered and on Medicare’s self-administered drug exclusion lists. It’s covered under Part D or the patient’s pharmacy benefit.
Are hyaluronic acid knee injections covered?
Often, for knee osteoarthritis after conservative treatment, with limits on how often they’re repeated. Some commercial plans no longer cover them, so benefits should be checked first.
Does an orthopedic practice need to enroll as a DME supplier to dispense braces?
To bill Medicare for braces and boots, yes. The practice enrolls as a DMEPOS supplier. Physicians are exempt from accreditation but must meet supplier standards.
Orthopedic and Rheumatology Billing at Medwave
Orthopedics and rheumatology share patients but bill very differently. Medwave handles global periods and joint injections on the orthopedic side, and infusion administration, drug units, and biologic authorizations on the rheumatology side. Our billing team keeps both at a 98% clean claim rate, and our denial management team works whatever still comes back.
Orthopedic surgeons need privileges at each hospital and ASC they use, and our credentialing team handles those along with payer enrollment, averaging 85 days. Practices with infusion suites get payer contracting support on drug reimbursement.
Whichever side of the practice is giving you trouble, the form below reaches the right people.