HCPCS Code K0835: Group 2 standard power wheelchair billing guide

Key Takeaways

HCPCS Code K0835 describes a Group 2 standard power wheelchair with a single power option, sling or solid seat/back, for patients weighing up to and including 300 lbs.

Medicare requires prior authorization for K0835 nationwide, effective 09/01/2018. Claims submitted without an approved prior authorization are automatically denied.

Single power option coverage (K0835-K0840) requires either a non-standard drive control interface or documented criteria for power tilt, power recline, or a similar power option.

Pabau’s claims management software helps DME suppliers and therapy practices track authorization status, attach CMN documentation, and submit K0835 claims without manual errors.

HCPCS Code K0835 covers a power wheelchair (Group 2, standard) with a single power option, sling or solid seat/back, for patients whose weight does not exceed 300 pounds. It is a Level II HCPCS code maintained by the Centers for Medicare and Medicaid Services (CMS) and applies to durable medical equipment (DME) claims billed to Medicare and most commercial payers. The code became effective on 10/1/2006 and remains valid for %%currentyear%% claims.

The short descriptor used on remittance advices is Pwc gp2 std sing pow opt s/b. The full long descriptor is: Power wheelchair, group 2 standard, single power option, sling/solid seat/back, patient weight capacity up to and including 300 pounds. Billing teams should use the long descriptor when documenting medical necessity and confirming code selection with the prescribing clinician.

DME suppliers billing HCPCS Code K0835 must track power wheelchair authorizations, rental cycles, and CMN expiration dates alongside active claim status. Getting the fundamentals of medical billing right keeps these moving parts from slipping.

Group 2 power wheelchair classification

CMS organizes power wheelchairs into groups based on drive system complexity, seating configuration, weight capacity, and available power options. Group 2 represents the standard tier above basic Group 1 chairs, offering greater programmability and expanded seating options without crossing into complex rehabilitative territory by itself.

Within Group 2, codes K0835 through K0843 are classified as complex rehabilitative power wheelchairs by Medicare, which means they can be either rented or purchased. This is distinct from standard power wheelchairs (K0813-K0820), which are capped-rental-only items. DME suppliers must inform beneficiaries of the rent-or-purchase option in writing before delivery.

K0835 specifically applies only when the patient’s weight is at or below 300 pounds and the seating system uses a sling or solid seat and back configuration. Patients exceeding 300 lbs who otherwise meet the same clinical criteria should be billed under K0837 (301-450 lbs) or K0839 (451-600 lbs). Selecting the wrong code based on weight capacity is one of the most common K0835 denial triggers.

Medicare coverage criteria for HCPCS Code K0835

Medicare covers HCPCS Code K0835 only when specific clinical and functional criteria are documented. Coverage follows the applicable Local Coverage Determination (LCD) issued by the DME MAC (Medicare Administrative Contractor) for the supplier’s jurisdiction. The four DME MAC jurisdictions (A, B, C, and D) are administered by two contractors: Noridian Healthcare Solutions handles Jurisdictions A and D, and CGS Administrators handles Jurisdictions B and C. Billing teams should verify the applicable LCD before submitting claims, as coverage language can vary by region.

General Medicare coverage criteria for Group 2 single power option wheelchairs (K0835-K0840) require that the beneficiary:

• Has a mobility limitation that significantly impairs the ability to perform activities of daily living
• Cannot adequately use a cane, walker, or manual wheelchair
• Has the physical and cognitive ability to safely operate a power wheelchair
• Has a home environment that supports power wheelchair use

To qualify specifically for the single power option upgrade, payer policies including the Cigna Medical Coverage Policy 0030 and Blue Shield of California’s power wheelchair policy require that the patient either: (a) needs a drive control interface other than a hand- or chin-operated standard proportional joystick, such as a head control, sip-and-puff system, or switch control; or (b) meets documented criteria for power tilt, power recline, or another approved power option. Clinicians prescribing K0835 should document which of these criteria is met explicitly in the medical record and on the CMN.

Physical therapists and occupational therapists at practices using physical therapy EMR software or occupational therapy software can embed standardized mobility assessment documentation into intake workflows, reducing the back-and-forth between the practice and the DME supplier at authorization time. Teams that also bill timed treatment should keep the Medicare 8-minute rule in view when coordinating those therapy visits.

Prior authorization requirements

CMS added HCPCS Code K0835 to the DMEPOS Prior Authorization Required List effective 09/01/2018, making prior authorization mandatory nationwide for all Medicare fee-for-service claims. This requirement is permanent, not a temporary program. Suppliers who deliver a K0835 chair without an approved prior authorization before delivery cannot bill Medicare for that item, even if the beneficiary is otherwise eligible.

The prior authorization request must be submitted to the applicable DME MAC before the item is provided. Required documentation typically includes:

• A written order (prescription) from the treating physician or allowed NPP
• A completed Certificate of Medical Necessity (CMN) for power wheelchairs
• Documentation of a face-to-face examination within 45 days of the order
• Clinical records supporting the mobility limitation diagnosis
• Detailed product description specifying the chair model and features ordered

The DME MAC will issue either an affirmative provisional determination (APD) or a non-affirmative provisional determination (NAPD). An APD does not guarantee payment but shifts the review burden from pre-payment to post-payment audit. A NAPD means the claim will be denied if submitted without correcting the identified deficiencies. Suppliers should track prior authorization status carefully, as the digital intake forms and documentation management tools that therapy practices use can help compile the required records packet before submission.

Commercial payers generally follow similar PA requirements for K0835, though timelines and documentation requirements differ. Always verify the specific payer’s PA policy before submission. Practices focused on HIPAA compliance for medical offices should ensure that all authorization communications, whether electronic or paper, are handled in accordance with the HIPAA Security Rule for protected health information (PHI).

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Billing modifiers for HCPCS Code K0835

Modifier usage is one of the highest-risk areas in K0835 billing. Applying the wrong modifier, or omitting a required one, triggers automatic denials. Four modifiers are commonly encountered with this code:

• KX modifier: Appended when the supplier affirms that all coverage criteria in the applicable LCD have been met and documentation is on file. Required for claims where the supplier has a valid prior authorization. Claims for K0835 submitted without KX when KX is required will deny.
• GA modifier: Used when the supplier has a signed Advance Beneficiary Notice (ABN) on file because coverage is expected to be denied. The GA modifier signals that the beneficiary has been notified and has agreed to pay out-of-pocket.
• KE modifier: A pricing modifier defined as “bid under round one of the DMEPOS competitive bidding program for use with non-competitive bid base equipment.” It is appended to an accessory HCPCS code when that accessory is furnished with base equipment that was not obtained through competitive bidding, so the correct fee schedule amount is applied.
• KC modifier: Defined as “replacement of special power wheelchair interface.” It is used only when replacing a special (non-standard) power wheelchair drive interface, never at initial issue, so it is uncommon for new K0835 orders but applies in certain interface-replacement scenarios.

Billing teams should consult the AAPC Codify HCPCS code reference to confirm current modifier guidance and any payer-specific modifier requirements. Cross-checking modifiers against the payer’s LCD and the CMS fee schedule is standard practice before final claim submission. Practices that handle therapy and DME billing often find that automating modifier checks at the claim-scrubbing stage catches the majority of these errors before they reach the payer.

Fee schedule, reimbursement, and competitive bidding

Medicare reimbursement for HCPCS Code K0835 is determined by the DMEPOS fee schedule and is subject to annual CMS updates. Actual payment amounts vary based on whether the supplier is in a competitive bidding area (CBA) and whether the claim is for a rental or purchase. Suppliers should look up the current allowed amounts using the CMS fee schedule search tool filtered for DME, selecting the appropriate geographic locality and claim type.

For suppliers operating outside a competitive bidding area, the national fee schedule applies. For those inside a CBA, the competitive bidding rate applies and is typically lower than the national rate. The DMEPOS Competitive Bidding Program covers many high-utilization product categories, and Group 2 complex rehabilitative power wheelchairs including K0835 have been subject to bidding rounds. Suppliers should confirm their competitive bidding contract status before quoting beneficiary cost-sharing amounts.

On the rent-or-purchase question: because K0835-K0843 are classified as complex rehabilitative power wheelchairs, they do not follow the standard 13-month capped rental pathway that applies to basic power wheelchairs. Suppliers must provide beneficiaries with written notice of both options before delivery, and should confirm whether K0835 is currently subject to a competitive bid rate in a given CBA before quoting beneficiary costs. Practices using automated claims workflows can build rent-versus-purchase decision logic into their documentation process so staff are prompted to complete the beneficiary choice disclosure at the point of order entry.

Related codes and how to choose between them

Selecting the correct code within the K0835 family depends on three variables: seating configuration, weight capacity, and whether the chair is capable of being upgraded to an expandable controller. Per CMS Policy Article A52504, K0835 and the adjacent codes K0836 through K0843 are all capable of upgrade to an expandable controller, making the KE modifier potentially relevant across the entire range.

The distinction between K0835 and K0836 is seating: K0835 uses a sling or solid seat and back, while K0836 uses a captain’s chair configuration. Neither the CMS fee schedule nor the LCD uses the word “better” to describe one over the other; the choice is entirely driven by the patient’s documented clinical needs and the equipment ordered. Billing the wrong seat configuration when the CMN specifies the opposite is an audit risk that frequently surfaces in post-payment review. Improving practice management software features for DME workflows often includes a code selection verification step tied to the CMN data fields to prevent this mismatch.

For patients requiring power seat elevation, CMS MM13277 (Power Seat Elevation Equipment on Power Wheelchairs) established codes K0830 and K0831 — complete Group 2 standard power wheelchair codes that include a seat elevator (sling/solid seat/back and captain’s chair, respectively), billed instead of K0835 rather than alongside it. For a complex rehabilitative power wheelchair, the seat elevation system is billed as accessory code E2298.

Wheelchair accessories such as a general use wheelchair seat cushion (E2601) carry their own HCPCS codes and are documented separately from the base chair, with a review of bundling edits under the applicable MAC’s LCD.

Practices focused on comprehensive patient scheduling workflows for DME-requiring patients can reduce documentation lag by pre-loading the code selection decision tree into patient intake, flagging weight, seating preference, and power option requirements at the initial assessment appointment.

Conclusion

Correct billing for HCPCS Code K0835 comes down to three non-negotiable steps: confirming the patient meets Group 2 single power option coverage criteria, securing prior authorization before delivery, and applying the right modifier combination at claim submission. Each step has a direct impact on whether the claim pays or denies.

Pabau’s claims management software helps practices attach CMN documentation, track PA status, and flag modifier issues before claims leave the building. If your team is managing K0835 claims alongside complex rehab chair documentation, structured medical forms documentation workflows are worth reviewing. To see how Pabau handles this end to end, book a demo with the team.

Continue your research

Need to streamline DME claims documentation? Claims management software from Pabau centralizes authorization tracking, CMN attachment, and claim submission in a single workflow.

Managing therapy documentation for wheelchair evaluations? Digital forms from Pabau let therapy practices capture structured mobility assessments and attach them directly to patient records.

Looking for broader practice management context? Practice management insights on the Pabau blog cover workflows, billing efficiency, and operational improvements for therapy and specialty practices.

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