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CPT Code

CPT code 28825 – Toe amputation at interphalangeal joint

Billable Code

Code Definition

28825 is the CPT code for amputation, toe; interphalangeal joint. It covers disarticulation of a single toe at the proximal or distal interphalangeal joint, inside the toe rather than at its base.

The joint level in the operative note decides the code. Amputation at the metatarsophalangeal joint is 28820, and amputation through the metatarsal, including the toe, is 28810. Missing TA-T9 digit modifiers commonly cause denials or rejections, depending on payer or MAC policy.

Section
10004-69990 Surgery
Subsection
20100-29999 Musculoskeletal system
Code range
28800-28825 Amputation
Billable
Yes
Code also known as
interphalangeal joint amputation, IP joint toe amputation, digit disarticulation, partial toe amputation
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Key takeaways

Key takeaways

CPT code 28825 covers toe amputation at the interphalangeal joint, while amputation at the metatarsophalangeal joint is CPT 28820.

The operative note must name the proximal or distal interphalangeal joint, because a note that only says the toe was removed cannot support 28825.

The TA-T9 digit modifiers identify both the side and the toe, so LT/RT is not additionally required unless a payer’s own policy asks for it.

The code carries a 90-day surgical global period, and post-op wound care visits billed separately within that window are a common audit finding.

Pabau’s claims management software checks insurer details before submission and sends CMS-1500 claims to thousands of US payers through Claim.MD.

CPT code 28825: Official descriptor and anatomical scope

CPT code 28825 is described by the American Medical Association as “Amputation, toe; interphalangeal joint.” The procedure is a disarticulation at the IP joint, not a cut through bone. The surgeon opens the skin over the joint, transects the collateral ligaments, separates the joint surfaces, and closes the flap over the remaining stump.

The code applies whether the surgeon works at the proximal IP (PIP) or distal IP (DIP) joint. That detail belongs in the operative note, but it doesn’t change the CPT selection. Amputation through the metatarsal, including the toe, is 28810. Amputation at the metatarsophalangeal joint is 28820. The diagram below maps each level to its code.

Diagram mapping toe amputation level to CPT code: distal or proximal interphalangeal joint is 28825, metatarsophalangeal joint is 28820, through the metatarsal shaft with the toe is 28810; every line takes a TA-T9 digit modifier
Both interphalangeal joints bill as 28825, and the code only changes at the base of the toe. Descriptors are from the AMA CPT code set.
Code Official descriptor Amputation level
28825 Amputation, toe; interphalangeal joint Proximal or distal IP joint (within the toe)
28820 Amputation, toe; metatarsophalangeal joint MTP joint (base of toe at foot)
28810 Amputation, metatarsal, with toe, single Through metatarsal shaft, including toe
28122 Partial excision (craterization, saucerization, sequestrectomy, or diaphysectomy) bone (eg, osteomyelitis or bossing); tarsal or metatarsal bone, except talus or calcaneus Partial bone excision, not amputation (toe phalanx is 28124)

Clinical indications and medical necessity

The overwhelming majority of IP joint toe amputations in the United States are driven by diabetic foot complications and peripheral vascular disease. According to the Centers for Medicare and Medicaid Services, payers require the operative record to show failed conservative management before covering an elective amputation. For urgent cases such as gangrene or wet infection, document imaging or lab evidence of tissue non-viability.

Medical necessity criteria vary by MAC jurisdiction. Check the applicable Local Coverage Determination for lower-extremity amputations before billing, as part of your routine billing compliance checks.

  • Diabetic foot ulcer with osteomyelitis: Most common indication. Requires wound culture, plain film or MRI evidence of bone involvement, and HbA1c within 90 days.
  • Peripheral arterial disease or critical limb ischemia: Most payers require a vascular surgery note with ABI or TcPO2 values.
  • Osteomyelitis without diabetes: A bone biopsy result or MRI-confirmed cortical destruction is typically required.
  • Gangrene (I96): Clinical and photographic documentation of devitalized tissue. An emergency presentation exempts the case from the failed-conservative-treatment requirement.
  • Traumatic injury (S98.x): Document the mechanism, the injury timeline, and the failed attempt at digit salvage.
  • Chronic non-healing ulcer: A wound care log showing 4 or more weeks of conservative treatment without improvement.

ICD-10 diagnosis codes paired with CPT code 28825

Diagnosis selection must reflect the operative note, not just the billing template. A diabetes code on a trauma-related amputation, or the reverse, is a medical necessity mismatch that auditors flag routinely. The table below shows the most frequently paired ICD-10-CM codes. Treat it as a starting framework and check each code against the patient’s documented clinical picture.

ICD-10-CM code Description Documentation note
E11.621 Type 2 diabetes mellitus with foot ulcer Wound size, depth, and duration in record; ABI or vascular note if PVD present
E11.52 Type 2 DM with diabetic peripheral angiopathy with gangrene Clinical or photographic evidence of gangrene; vascular assessment
M86.671 / M86.672 Other chronic osteomyelitis, right / left ankle and foot MRI or bone biopsy with culture result. The code stops at ankle and foot, so the note must place the infection in the toe.
I96 Gangrene, not elsewhere classified Emergency or urgent presentation; tissue non-viability documented clinically
L97.519 / L97.529 Non-pressure chronic ulcer of other part of right / left foot with unspecified severity Wound care log showing 4+ weeks of conservative treatment; toe-level wound documentation
S98.121A / S98.122A Partial traumatic amputation of right / left great toe, initial encounter Mechanism, date of injury, and salvage attempt documented; initial encounter only

Diabetic cases rarely stand on one code. E11.621 carries a “use additional code” note, so pair it with the L97.5- code that records the toe ulcer’s site and severity.

Pro Tip

Run an ICD-10 crosswalk before finalizing your diagnosis codes. The AAPC CPT-to-ICD-10 crosswalk tool lists accepted pairings by code and flags known edits. That reduces the risk of a medical necessity mismatch denial before the claim ever leaves the practice.

Modifiers for toe amputation claims

A 28825 claim identifies the toe with a digit modifier from TA to T9. Each one encodes the side as well as the digit, from TA for the left great toe to T9 for the right fifth toe. LT/RT is therefore not additionally required, although some payers ask for it in their own policies. Missing digit modifiers commonly cause denials or rejections, depending on payer or MAC policy.

Modifier Meaning Required by Notes
TA-T9 Specific toe identification (TA = left great toe, T9 = right fifth toe) Medicare; most MACs Identifies the side and the exact digit amputated; must match the operative note and ICD-10 code
LT / RT Left / Right foot Only where a payer specifically asks for it Not needed alongside TA-T9, which already encodes the side
59 Distinct procedural service When multiple toes amputated in same session Each additional toe billed as a separate line with modifier 59; NCCI edits apply
22 Increased procedural services Circumstances of unusual complexity Requires a separate written narrative in the operative note explaining added work; not a routine modifier
52 Reduced services Procedure completed but less than described Use for a partial disarticulation or abandoned procedure, and document the reason clearly

Medicare and payer reimbursement for CPT 28825

Under the CMS Physician Fee Schedule, CPT code 28825 carries a 90-day surgical global period. Post-operative visits related to the amputation during that window are bundled into the global payment. Billing them separately is a recurring audit finding flagged by the OIG.

Payment amounts vary by Geographic Practice Cost Index (GPCI) and by facility or non-facility setting. Annual updates take effect each January 1, so check current RVUs and rates in the CMS MPFS Look-Up Tool. The table below shows how the setting changes the calculation and carries no dollar figures.

Setting Practice expense (PE) RVU Global period Verify rate via
Non-facility (office) Higher PE component 90 days CMS MPFS Look-Up Tool
Facility (hospital OR / ASC) Lower PE component 90 days CMS MPFS Look-Up Tool

What the 90-day global includes: The amputation itself, plus the pre-operative E/M on the day of surgery. That E/M is bundled when the decision for surgery was made at a prior visit. The global also covers intraoperative services and every related post-operative visit in the 90 days, including wound checks and suture removal.

What is not bundled: Treatment for unrelated conditions and significant new complications that need a return to the OR. E/M visits documented as unrelated to the amputation are also billable. Bill these with modifier 24 (unrelated E/M during global) or modifier 78 (return to OR for a related complication).

Medicaid reimbursement varies by state program and is typically lower than Medicare. Commercial payers set their own fee schedules, so check each payer’s allowable before assuming Medicare rates apply.

What the operative note and chart must show

Vague operative notes are the primary audit trigger on CPT 28825 claims. “Toe removed” does not specify the joint level, so it cannot support 28825 over 28820. The operative note must name the interphalangeal joint explicitly.

  • Amputation level: The note must state “disarticulation at the [proximal/distal] interphalangeal joint,” not “toe amputation” or “partial toe removal.”
  • Pre-operative diagnosis: Supporting labs (CBC, wound culture, bone biopsy) or imaging (plain film or MRI) confirming the clinical indication.
  • Vascular assessment: Required when PVD or PAD is the primary indication, as an ABI, TcPO2, or vascular surgery consultation note.
  • Consent documentation: Signed informed consent that describes the procedure at the correct anatomical level.
  • Digit identification: Must match the TA-T9 modifier selected, for example TA (left great toe). Add LT/RT only where a payer specifically asks for it.
  • Post-operative note: If billing a same-day E/M, document that the decision for surgery was made at a prior separate encounter.
  • Failed conservative treatment log: Wound care records showing the duration and treatments attempted, for non-emergency indications.

Common claim denial reasons and how to prevent them

Most 28825 denials follow a predictable pattern. Catching them before submission through systematic denial management is significantly cheaper than working a remittance after the fact.

Denial reason Root cause Prevention tip
Missing toe modifier TA-T9 digit modifier not appended Build a TA-T9 check into the billing workflow. Hold any 28825 claim without one before submission.
Wrong code selected (28820 billed instead of 28825) Operative note does not specify joint level; coder defaults to more familiar code Require surgeons to document “interphalangeal joint” or “metatarsophalangeal joint” explicitly; no coding from vague descriptions
Insufficient medical necessity documentation Conservative treatment history or vascular assessment absent from record Create a pre-op documentation checklist; do not submit until all required elements are in the chart
Diagnosis code does not support amputation level Billing E11.621 when the patient had a traumatic injury, or using an unspecified code when a laterality-specific code exists Match ICD-10 to the operative note’s stated etiology. Use laterality-specific codes that match the side the TA-T9 modifier identifies.
Unbundling error (multiple toes same session) Modifier 59 not appended when billing 28825 for two different digits Bill each digit on a separate line with modifier 59; verify NCCI edit pairs for the code combination
Global period violation Post-op wound care billed separately within the 90-day window Track global period end dates in the practice management system. Require modifier 24 or 78 documentation before overriding global billing restrictions.

High-volume podiatric surgery practices should review denial codes in medical billing by code family each month, which reveals patterns before they become systemic. A single modifier error in a billing template can repeat across dozens of claims before anyone catches it on remittance review.

Pro Tip

After any 28825 denial, check whether the same billing template was used for other toe amputation claims in the same billing period. A missing TA-T9 modifier on one claim typically means the same omission exists across every claim submitted from that template. Correct the template first, then rework the individual claims.

How claims management software keeps 28825 claims clean

Without an integrated system, a 28825 claim often means re-keying patient, procedure, and payer details into a separate clearinghouse portal. Each re-keyed field is another chance to drop a digit modifier or mistype a member ID.

Pabau, the practice management platform we build, includes built-in claims management that generates the claim from the invoice you already raised. Background validation checks confirm that insurer details such as membership numbers and authorization codes are in place before it goes out. Through the Claim.MD integration, CMS-1500 claims reach thousands of US payers without leaving Pabau.

Eligibility checks run before treatment, and remittances come back into Pabau against the claims they settle. Your team sees each claim move from submitted to paid or denied in one view. That way, a denial gets worked while the operative note is still fresh.

Submit cleaner 28825 claims from day one

Pabau builds each claim from the invoice you already raised and sends it to thousands of US payers through Claim.MD. Statuses and remittances flow back into the same record, so denials surface fast.

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Conclusion

The code on a toe amputation comes down to one phrase in the operative note. If the surgeon names the interphalangeal joint, 28825 holds up. If the note only says the toe was removed, no modifier or diagnosis code will rescue the claim.

So fix the inputs before the claim leaves. Use an operative-note template that forces the joint level, and check the TA-T9 modifier against the side in the diagnosis code. Then track the 90 days after surgery so post-op visits stay inside the global payment.

The trade-off is a minute or two of extra documentation per case, against reworking denied claims weeks later. Book a demo to see how Pabau keeps your 28825 claims, statuses, and remittances in one place.

Continue your research

Continue your research

Need to understand how clearinghouse edits catch errors before submission? Our Claim.MD clearinghouse guide explains how pre-submission validation works before a claim reaches the payer.

Looking for a structured approach to reducing denied claims across your practice? Our clean claim guide covers the documentation and submission standards that keep rejection rates low.

Curious how electronic remittance works after a claim is paid or denied? Our electronic remittance advice guide walks through ERA formats and how to action denial reason codes efficiently.

Frequently asked questions

What is CPT code 28825?

CPT code 28825 is the procedure code for amputation of a toe at the interphalangeal joint. It covers disarticulation at either the proximal or distal IP joint. CPT 28820 covers amputation at the metatarsophalangeal joint, and 28810 covers amputation through the metatarsal, including the toe.

What is the difference between CPT 28825 and CPT 28820?

The joint level decides the code. 28825 applies when the surgeon disarticulates at an interphalangeal joint, inside the toe. 28820 applies at the metatarsophalangeal joint, where the toe meets the foot. The operative note must state the joint level, because vague wording such as “toe removed” supports neither code on appeal.

What modifiers does Medicare require for CPT 28825?

Medicare expects a TA-T9 digit modifier that identifies the exact toe amputated. For example, TA is the left great toe and T9 is the right fifth toe. Because the T-modifiers already encode the side, LT/RT is not additionally required. Policy varies by payer and MAC, so check the local rules before submitting.

What is the global period for CPT 28825?

CPT 28825 carries a 90-day surgical global period under the Medicare Physician Fee Schedule. Post-operative visits related to the amputation within that window are bundled into the global payment. Billing a wound check or suture removal as a separate E/M visit in that period is a common audit finding. Use modifier 24 only for documented unrelated visits.

Is CPT 28825 the same as a transmetatarsal amputation?

No. A transmetatarsal amputation removes all the toes by cutting through the metatarsal shafts, and it is coded separately (typically CPT 28805). CPT 28825 is limited to disarticulation at the interphalangeal joint of a single toe, and the metatarsal bones are not involved.

Why do claims for CPT 28825 get denied?

Denials on CPT 28825 usually trace to one of three causes. A TA-T9 digit modifier is missing, the operative note is vague about joint level, or medical necessity documentation is thin. Thin documentation usually means a missing vascular assessment or wound care history. Global period violations, where post-op visits are billed separately within 90 days, also recur.

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