Orthotics and prosthetics
L5331 — Hip disarticulation, canadian type, molded socket, endoskeletal system, hip joint, single axis knee, sach foot
HCPCS code L5331 is used on U.S. medical bills for orthotics and prosthetics: Hip disarticulation, canadian type, molded socket, endoskeletal system, hip joint, single axis knee, sach foot.
- Typical setting: Outpatient or facility
- National avg charge (illustrative): DMEPOS fee schedule — custom vs OTS pricing differs sharply.
- Most-disputed reason: Custom-fit billed when off-the-shelf was provided
What it means
What L5331 actually means
Hip disarticulation, canadian type, molded socket, endoskeletal system, hip joint, single axis knee, sach foot.
The official CMS HCPCS Level II descriptor for this code is shown above. If the description on your bill does not match the service you actually received, that is a reason to ask for the itemized bill and dispute the line.
Common errors with this code
What goes wrong on real bills.
Use these as review prompts, not conclusions. The right next step is to compare the bill, itemized charges, and EOB before paying.
- Quantity or units of service that exceed what the medical record supports.
- Duplicate billing on the same date of service.
- Missing or incorrect modifier (e.g., JW for drug waste, RT/LT for sides).
- Custom-fit billed when off-the-shelf was provided without supporting documentation.
If you see L5331 on your bill
Three steps before paying.
1. Get the itemized bill. If your statement only shows a summary, request the CPT-level itemized bill before paying. Generate the request language →
2. Cross-check against the EOB. Compare what your insurer's Explanation of Benefits says you owe versus what the hospital is asking. They disagree more often than people think. Read the bill-vs-EOB guide →
3. Run a free Bill Scan. Upload the bill (and EOB if you have it) and BillBusted will flag the most likely issues with this specific code in your specific state. Run free scan →
Related codes
Other codes in this category.
People who land on L5331 often also see these adjacent codes on the same bill.
HCPCS
L0120 — Cervical, flexible, non-adjustable, prefabricated, off-the-shelf (foam collar)
Cerv flex n/adj foam pre ots
HCPCS
L0130 — Cervical, flexible, thermoplastic collar, molded to patient
Flex thermoplastic collar mo
HCPCS
L0150 — Cervical, semi-rigid, adjustable molded chin cup (plastic collar with mandibular/occipital piece)
Cerv semi-rig adj molded chn
Related BillBusted guides
Plain-English reads if you see L5331 on a bill.
L5331 FAQ
Plain-English answers.
What is L5331 used for on a medical bill?
HCPCS code L5331 is used on medical bills for orthotics and prosthetics: Hip disarticulation, canadian type, molded socket, endoskeletal system, hip joint, single axis knee, sach foot. Billing mistakes can happen, and codes in this category most often get flagged for custom-fit billed when off-the-shelf was provided. If you see L5331 on your bill, request the itemized statement and compare the units, date of service, and description to your Explanation of Benefits before paying.
How much should L5331 cost?
How much L5331 should cost depends on your payer and region. Billing mistakes can happen, and pricing for this HCPCS code is set by Medicare fee schedules for Medicare claims and by negotiated allowed amounts for commercial plans. Check the Medicare fee-schedule lookup tool, your insurer's member portal, or run a free BillBusted scan to compare your charge against typical allowed amounts.
Can I dispute a L5331 charge on my medical bill?
Yes, you can dispute a L5331 charge on your medical bill if the units, modifier, date of service, or coverage doesn't match the medical record or your insurance benefits. Request the itemized bill, compare to your EOB, and use BillBusted's Resolution Pack to draft the dispute letter if needed.
Don't pay L5331 blindly.
The free scan tells you in under 60 seconds whether this charge looks reasonable for your situation.