CPT 01490: Anesthesia for lower leg cast application and removal

Key Takeaways

CPT 01490 is the anesthesia code for a lower leg cast application, removal, or repair, billed at 3 base units, the same base value carried by its broader neighbor, CPT 01462.

Reimbursement still runs through the standard anesthesia formula: (base units + time units + modifying units) x conversion factor, so time documentation and modifiers matter as much as the code itself.

Medicare pays 0 additional units for every physical status modifier, P1 through P6. The extra units some payers add for P3-P5 come from the ASA Relative Value Guide or a specific commercial contract, never from Medicare.

The coding risk runs opposite to what many teams expect: coders default to the broader CPT 01462 out of habit, even on a cast-only visit that CPT 01490 was built to cover. Practice management software like Pabau keeps claims and documentation in one place, so problems surface before you submit.

A lower leg cast looks like the simplest possible anesthesia encounter. It’s tempting to reach for whichever code in the 01462-01522 range comes to hand first. CPT 01490 is the one built specifically for it. It covers anesthesia for a lower leg cast application, removal, or repair, billed at 3 base units.

The mix-up usually runs the opposite way from what you’d expect. Coders rarely undercode a casting visit. They default to the broader closed-procedure code next door, CPT 01462, out of habit, because it covers so much more ground.

Here’s what sets CPT 01490 apart, and how to keep a cast-only claim clean from the first note to the paid remittance.

What CPT 01490 actually covers

CPT 01490 is narrow by design. It applies only when a provider gives anesthesia so a patient can tolerate a lower leg cast being put on, taken off, or fixed. Nothing more.

The clinical picture usually falls into one of three categories, and orthopedic and sports medicine practices see all three regularly. A new cast gets placed under anesthesia, often for a pediatric patient or someone with severe pain or anxiety. Sometimes a cast gets removed under anesthesia instead. Or a cast gets repaired without redoing the reduction underneath it.

If the same visit also involves a closed reduction or manipulation, the encounter shifts to CPT 01462 instead. More on that distinction further down.

How the anesthesia billing formula prices a 01490 claim

Three base units are the starting point, not the finish line. Anesthesia billing runs on its own formula, one that no other CPT category shares.

Formula: (B + T + M) x CF = total reimbursement.

Worked example: A below-knee cast application runs 15 minutes under anesthesia for a P1 pediatric patient (0 modifying units under Medicare). That’s 3 base units plus 1 time unit plus 0 modifying units, or 4 units total, times the current conversion factor.

Pull the live conversion factor from the CMS fee schedule tool before quoting a dollar figure. CMS updates it every year and adjusts it by locality.

Anesthesia time documentation ties the units to the record

One anesthesia time unit equals 15 minutes of continuous service, per CMS rules. Start the clock when the anesthesiologist begins preparing the patient, not when the cast material goes on. Stop it once the patient is safely handed off to recovery.

• Round partial units to your payer’s stated increment. Most round to the nearest 15 minutes.
• Log start and stop times in the anesthesia record itself, not only in the procedure note.
• When a CRNA and an anesthesiologist share a case, each documents their own time separately.

Physical status modifiers don’t add Medicare units, but they’re still required

Every CPT 01490 claim needs a physical status (PS) modifier attached, whether or not it changes the payment.

Important: Medicare pays 0 additional units for every physical status modifier, P1 through P6, on CPT 01490 or any other anesthesia code. Any extra units for P3 through P5 come from the ASA Relative Value Guide or a specific commercial payer contract, never from Medicare.

The modifier itself is still mandatory on the claim. It just doesn’t move the Medicare payment.

Provider role modifiers decide who gets paid: AA, QK, QX, QY, QZ

These modifiers identify who delivered the anesthesia and at what supervision level. Get one wrong, and the payer has no reliable way to route payment. The American Society of Anesthesiologists (ASA) defines these provider-type modifiers alongside the physical status set.

QK and QX work as a pair. Together they add up to roughly the same total as a personally performed AA claim, just split between the anesthesiologist and the CRNA. Pairing AA with QK on the same claim is a contradiction. It gets flagged quickly, because AA already means the anesthesiologist handled the entire case alone.

Medicare, locality, and where the conversion factor comes from

Medicare prices CPT 01490 with its own anesthesia conversion factor. That figure is separate from the standard Medicare Physician Fee Schedule conversion factor, and it updates every year. Pull the current figure from the CMS fee schedule tool rather than relying on a number from last year.

Locality moves the number too. Geographic Practice Cost Indices (GPCI) mean the same CPT 01490 claim pays differently in Manhattan than in rural Alabama.

Pabau’s claims management software keeps claims and documentation in one place. A stalled or underpaid claim then shows up on the status dashboard early, not as a surprise months later.

Keep 01490 claims moving instead of stuck in review

Pabau's claims management software checks that required insurer fields, like membership numbers and authorization codes, are complete before you can send a claim, then tracks it from submitted to paid on one status dashboard.

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Qualifying circumstance add-on codes for a 01490 claim

Qualifying circumstances are add-on codes. They ride alongside CPT 01490 and never stand alone, and they only apply when the record backs them up.

For a cast-only visit, 99100 is the one that shows up most. Pediatric patients make up a large share of lower leg casting under anesthesia. 99140 applies far less often here than on a fracture reduction. A routine cast application, removal, or repair is rarely an emergency in itself.

Both 99116 and 99135 are essentially never appropriate on a 01490 claim. They describe deliberate whole-body cooling or induced low blood pressure. Those techniques belong to complex cardiac, vascular, or neurosurgical cases, not a lower leg cast.

Add-on eligibility is always code-specific. See CPT 01829 for the add-on codes that fit a diagnostic wrist arthroscopy instead.

ICD-10 codes that support medical necessity for a 01490 claim

CPT 01490 needs a paired ICD-10-CM diagnosis to establish why anesthesia was medically necessary for the cast. The diagnosis carries the clinical reason; CPT 01490 carries the service.

Use the 7th character A for an initial encounter and D for a subsequent encounter. CPT 01490 explicitly covers cast removal and repair, not just the first application. Most follow-up 01490 claims should therefore carry a D, not an A. Match laterality to the operative or procedure note every time.

Many patients move into physical therapy once the cast comes off. Prolonged immobilization can occasionally lead to heterotopic bone formation, coded as ICD-10 M61.9, a separate complication from the original fracture.

CPT 01490 vs CPT 01462: Pick the code that matches the encounter

Both codes live in the same lower leg family, and both carry 3 base units, which is exactly why they get confused. The difference is what happened in the room.

That last row is the one worth double-checking. CPT 01462’s breadth makes it an easy default. A coder scanning quickly for “cast” and “lower leg” can end up billing the broader code for a visit that never involved a reduction at all. Pabau’s guide to CPT 01462 covers that broader code’s full scope, base units, and modifiers in detail.

Related lower leg anesthesia codes, and where 01490 fits

CPT 01490 sits inside a cluster of lower leg anesthesia codes. Knowing the neighbors prevents a miscode when the operative note describes something 01490 was never meant to cover. See CPT 01480 for the open-bone counterpart in the same region.

Notice the jump at 01500. Arterial procedures carry 8 base units, more than double most of their lower leg neighbors. Vascular work on an artery is materially more complex than a cast change. Billing a vascular-level code for a cast visit, or the reverse, both distort the claim.

One joint up, anesthesia for a knee procedure like a popliteal fistula repair falls under CPT 01432 instead, outside this lower leg cluster entirely. Match the code to what the operative or procedure note actually describes, every time.

How a 01490 claim moves from cast room to paid remittance

A 01490 claim starts in the anesthesia record, not the billing office. The provider documents the physical status, the start and stop time, and exactly which service was performed: application, removal, or repair. That note becomes the source for everything downstream.

Next, the coder pulls the physical status modifier and the provider role modifier, AA, QK, QX, QY, or QZ, straight from that record. The coder then matches an ICD-10-CM code to the diagnosis on file, and checks whether any qualifying circumstance genuinely applies.

From there, the claim goes to the clearinghouse, which checks for basic completeness before it ever reaches the payer. A missing provider role modifier is a common bounce point here. Once the claim lands with the payer, the anesthesia conversion factor and locality adjustment set the final allowed amount.

A claim that stalls almost always traces back to one of the first two steps. Either the anesthesia record has incomplete documentation, or a modifier doesn’t match what’s on file.

Before you submit: A quick checklist for 01490 claims

• Confirm the operative note describes a cast application, removal, or repair, with no reduction or manipulation attached.
• Attach a physical status modifier, P1 through P6, even though Medicare adds 0 units for any of them.
• Attach one provider role modifier: AA, QK, QX, QY, or QZ, never AA alongside QK.
• Match the anesthesia start and stop times in the record to the time units on the claim.
• Check that any qualifying circumstance code genuinely applies before adding it. 99116 and 99135 rarely belong on a cast-only claim.
• Confirm the ICD-10-CM code, laterality, and encounter character (A or D) match the clinical note.

Common mistakes that get a 01490 claim denied

• Billing CPT 01462 out of habit: when the note documents only a cast application, removal, or repair, with no reduction, 01490 is the correct and more specific code.
• Missing physical status modifier: a claim without a P1-P6 modifier is routinely returned as incomplete, even though it adds 0 Medicare units.
• Recording surgeon time instead of anesthesia time: the anesthesia clock starts at patient preparation, not when the cast material is applied.
• Missing provider role modifier: without AA, QK, QX, QY, or QZ, a clearinghouse can’t identify who performed the service.
• Stacking contradictory modifiers: AA and QK on the same claim can’t both be true, and it’s an automatic denial trigger.

Practices running billing through one connected system catch most of these before a claim ever leaves the building. Pabau’s claims management software keeps claim data and documentation together. A status dashboard shows exactly where each claim sits. That means a stalled claim gets noticed while there’s still time to fix it.

Conclusion

CPT 01490 is a narrow code doing a specific job: anesthesia for a lower leg cast application, removal, or repair, and nothing beyond that. Get the physical status modifier right, along with the provider role modifier. Match the time documentation and code selection too, and a claim this simple should go through clean the first time.

Practice management software like Pabau brings claims management into the same system as scheduling and clinical notes. Required fields get checked before a claim can be sent. A status dashboard then shows where each one sits, from submitted through paid.

That way, a stalled claim gets noticed early instead of showing up as a denial weeks later. If claim delays are costing your practice time, book a demo to see how Pabau keeps claims and documentation in one place.

Continue your research

Billing a closed reduction or manipulation instead of a straightforward cast? CPT 01462 covers the broader closed-procedure code for the same lower leg, ankle, and foot region.

Need the tibia and fibula version of this code? CPT 01392 covers anesthesia for open tibia and fibula surgery in the same lower leg region.

Coding anesthesia for a different specialty entirely? CPT 00912 covers TURBT anesthesia billing, with its own base units and modifiers.

Frequently asked questions