HCPCS Code K0831: Power wheelchair group 2 standard seat elevator

Key takeaways

HCPCS Code K0831 describes a group 2 standard power wheelchair with a captains chair seat and a seat elevator, billed under Medicare Part B.

Coverage requires a face-to-face evaluation by the treating physician, documented medical necessity, and compliance with the applicable local coverage determination (LCD).

K0831 differs from K0835 in the power option: K0831 names the seat elevator, while K0835 covers a single power option other than seat elevation.

The full CMS descriptor, not a shortened version of it, is what decides between K0831, K0835, K0836, K0841 and K0842.

Practice management software like Pabau helps suppliers track prior authorization status, attach medical necessity records, and submit clean K0831 claims.

HCPCS Code K0831 is the Medicare billing code for a group 2 standard power wheelchair with a captains chair seat and a seat elevator. Suppliers bill it to the beneficiary’s DME MAC under the Medicare Part B durable medical equipment benefit.

Two documentation problems account for most K0831 denials: a missing face-to-face evaluation record, and an incomplete certificate of medical necessity.

This guide covers the full descriptor, the coverage criteria, and the documentation checklist. It then walks through the fee schedule structure, the billing steps, and the related K-codes suppliers confuse with K0831.

HCPCS Code K0831: Definition and code descriptor

HCPCS Code K0831 is a Level II HCPCS code maintained by the Centers for Medicare & Medicaid Services (CMS). The official descriptor reads: Power wheelchair, group 2 standard, seat elevator, captains chair, patient weight capacity up to and including 300 pounds.

The code sits in the power mobility device (PMD) category within the durable medical equipment benefit of Medicare Part B.

Two elements of that descriptor do the work. A captains chair is an integrated seat and back, not a separate sling or solid seat and back. The seat type is therefore part of the code choice. The seat elevator is the named power option, which is why K0831 is not interchangeable with the other group 2 standard codes.

Group 2 power wheelchair classification and what “standard” means

CMS organizes power wheelchairs into groups 1 through 5, based on performance characteristics and the severity of the beneficiary’s functional limitations. Group 2 sits in the middle of that range. It carries more stability and capability than a Group 1 chair. It also stops short of the complex rehabilitation features that define Groups 3 through 5.

“Standard” within Group 2 designates the base drive system. Standard bases use a four-wheel or mid-wheel-drive configuration, within the speed, turning radius, and obstacle-climbing specifications CMS sets for the group.

The seat elevator is what separates K0831 from the other Group 2 standard codes. That system raises the seat vertically, so the beneficiary can reach elevated surfaces and transfer more safely.

K0831 coverage criteria: What Medicare requires

Medicare coverage for K0831 is governed by the local coverage determination (LCD) published by the beneficiary’s DME MAC. The power mobility devices LCD sets out the base power wheelchair requirements.

It adds separate criteria that must be met before seat elevation is covered. Coverage policy is revised periodically, so review the version that was active on the date of service rather than the one you read last year.

At a minimum, Medicare coverage for HCPCS Code K0831 typically requires the following:

• Group 2 base eligibility: The beneficiary must have a mobility-limiting condition that requires a power wheelchair rather than a manual wheelchair or scooter. The treating physician must document that the patient cannot self-propel a manual wheelchair.
• Seat elevation medical necessity: The physician must document a specific medical need for the powered seat elevation feature. Safe transfers, pressure injury prevention, and functional reach at home are the usual grounds.
• Face-to-face evaluation: A face-to-face examination by the treating physician or other qualified clinician must occur within a defined timeframe before the equipment is dispensed. This exam must be documented in the medical record.
• Home mobility assessment: Documentation must confirm the beneficiary’s home environment can accommodate the device and that the patient is capable of operating it safely.
• LCD compliance: Every coverage criterion in the governing LCD for the beneficiary’s jurisdiction must be satisfied. Two contractors administer the DME benefit: Noridian covers Jurisdictions A and D, and CGS covers Jurisdictions B and C.

Documentation requirements before you submit

Incomplete documentation is the leading cause of K0831 denials and post-payment audits. Medicare’s DME standards go beyond the record-keeping rules that apply to any patient chart. The claim has to prove both the base chair and the seat elevator were medically necessary. Every element below belongs in the record before the claim goes out.

Medicare fee schedule and reimbursement rates

Medicare reimburses K0831 under the DMEPOS fee schedule, which CMS updates annually. Rates vary by MAC jurisdiction, and by whether the supplier sits inside a competitive bidding area (CBA). Rural non-CBA locations may receive an adjusted rate under the rural adjustment policy.

The table below maps the rate structure rather than the dollar amounts, because the amounts change every January. Check the current allowable against the annual DMEPOS fee schedule files before you bill.

Power wheelchairs are normally paid under a capped rental methodology. Medicare pays a monthly rental rate for up to 13 continuous months of medical need, and ownership then transfers to the beneficiary. The supplier keeps servicing the equipment after the capped rental period ends.

Confirm whether the beneficiary’s address falls inside a CBA before billing. Competitive bid rates apply only to accredited suppliers holding a contract for that bid area.

Prior authorization requirements for K0831

CMS operates a prior authorization (PA) program for certain DMEPOS items, including some power wheelchairs. Whether K0831 falls within the current PA list depends on CMS policy on the date of service.

Verify its PA status with the DME MAC before the chair is dispensed. Checking eligibility and PA status before the face-to-face evaluation catches the requirement early, rather than on the day of delivery.

Where prior authorization is required, the process generally follows these steps:

1. Obtain all required documentation (physician order, face-to-face notes, supporting medical records).
2. Submit a PA request to the appropriate DME MAC with the completed documentation package.
3. Receive a provisional affirmation decision before delivering the equipment to the beneficiary.
4. Record the PA control number and attach it to the subsequent claim submission.
5. Bill the claim only after delivery is confirmed and the PA control number is obtained.

A provisional affirmation from the MAC does not guarantee payment. The claim still has to meet every billing requirement on its own. Where a PA request is non-affirmed, the supplier can resubmit or appeal with additional documentation before dispensing the chair.

How to bill K0831: Step-by-step billing guidelines

Billing K0831 correctly comes down to three fields: place of service, the rental or purchase modifier, and the diagnosis code that carries medical necessity.

An error in any of them produces a denial that takes weeks to unwind. Suppliers submit DMEPOS claims on the CMS-1500 form, or its electronic equivalent, the 837P transaction. The same clean claim submission standards that govern professional billing apply to this claim.

• Place of service: Use POS 12 (Home) when the equipment is used primarily in the beneficiary’s home. This is the most common POS for power wheelchair claims.
• Modifier RR: Append modifier RR (rental) when billing the monthly rental for the first 13 months. Modifier NU (new) is used when billing a purchase.
• Quantity: Bill one unit per month during the rental period. Do not bill for months in which the equipment was not in the beneficiary’s possession.
• Diagnosis code: Link a valid ICD-10-CM diagnosis code that supports the medical necessity for a Group 2 power wheelchair with seat elevation. The diagnosis code must match the condition documented in the face-to-face evaluation.
• NPI and PTAN: The supplier’s National Provider Identifier (NPI) and Provider Transaction Account Number (PTAN) must appear on the claim. The billing NPI must match the enrolled supplier.
• Clean claim standards: Verify beneficiary eligibility and confirm the written order date precedes delivery. Check that every required field is complete before the claim is transmitted.

Three errors account for most K0831 rejections. They are a claim dated before the written order, the wrong rental modifier, and a missing PA control number. Each one produces a denial that needs a corrected claim or an appeal. Reading the remittance advice against the common denial codes narrows the cause quickly and cuts the rework.

K0831 vs. related power wheelchair HCPCS codes

Each code in the Group 2 power wheelchair family carries a distinct descriptor. Billing a neighboring code counts as a coding error. The AAPC HCPCS Level II code lookup lists the descriptors side by side. The table below covers the codes most often mistaken for K0831.

The line between K0831 and K0835 is the power option itself. K0831 names the seat elevator. K0835 covers a single power option other than seat elevation, such as a powered elevating leg rest.

Its seat is a sling or solid seat and back. K0836 is that same single power option on a captains chair. Where the chair carries two or more power options, the group 2 standard codes are K0841 and K0842.

Two variables therefore decide the code: the seat type, and which power option the descriptor names. The matrix below lays out both across the family.

There is no direct Group 3 equivalent of K0831. At Group 3 the seat elevation system is billed separately from the base chair, using an add-on code such as E2298. Check the chair’s configuration against the descriptor before coding, and use the manufacturer’s product coding letter where one exists.

Regulatory history: How CMS coded seat elevation

Seat elevation reached the code set through the HCPCS Level II coding process. Stakeholders apply for a new or revised code, and CMS grants it where clinical evidence supports a distinct product category.

K0831 and its sibling codes were established that way. That history also explains why the seat elevator sits in the base descriptor at Group 2 but not at Group 3.

Industry sources, including HME Business and the VGM Group, reported a pause in CMS coding and funding decisions for seat elevation at Group 2. CMS was reviewing the clinical evidence at the time.

Before filing, check whether K0831 is currently payable and which LCD governs it, using CMS Change Request transmittals and the DME MAC coverage database. Policy for seat elevation has kept moving as CMS revisits its power mobility coding decisions.

How Pabau keeps DME claim documentation audit-ready

Running K0831 claims by hand across a caseload creates a documentation bottleneck. A lapsed prior authorization turns a covered claim into a denial. So does an evaluation dated outside the window, or a delivery ticket nobody signed.

Practice management software like Pabau keeps that trail in one record instead of across separate systems. Pabau’s claims management for suppliers shows claim status by stage. It holds the written order and the evaluation notes against the claim itself, and flags any claim still waiting on authorization.

Practices that also run the clinical side of the evaluation get the same benefit upstream. Structured intake forms and templated evaluation notes capture the face-to-face record completely at the point of care. Nobody has to reconstruct it from memory a month later.

The outcome is that the documents an auditor asks for are already attached to the claim. A post-payment review becomes a lookup instead of a search through paper files.

Manage DME claims from intake to reimbursement

Pabau’s claims management tools help DME suppliers document medical necessity, track prior authorization status, and submit clean K0831 claims to Medicare without the paperwork bottlenecks.

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Conclusion

K0831 is one of the easier codes to get right and one of the easier claims to lose. The descriptor settles the coding question on its own: a group 2 standard base, a captains chair, a seat elevator, and a 300-pound weight capacity. What settles payment is whether the evaluation, the order, and the authorization are all on file in the right sequence.

If you change one thing, change the sequence. A written order dated after delivery, or a PA number obtained after the chair went out, fails on a technicality that no appeal narrative repairs. Build the check into dispensing rather than into billing, and the denial rate follows.

Book a demo to see how Pabau tracks DME claim documentation from the face-to-face evaluation through to reimbursement.

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