HCPCS code K0733 – Sealed lead acid battery, 12-24 Ah

Key takeaways

K0733 bills one 12 to 24 amp hour sealed lead acid battery for a power wheelchair, so two batteries means two units.

Medicare pays for a sealed battery separately from the power wheelchair base and allows up to two batteries at any one time.

Non-sealed batteries are denied as not reasonable and necessary, and group-size batteries such as U-1 or 22NF have their own E codes.

A replacement battery takes the RB modifier, but a battery supplied with a new wheelchair base never does.

Every K0733 line needs one of KX, GA, GY or GZ, or the DME MAC rejects it as missing information.

HCPCS code K0733 covers one sealed lead acid battery

HCPCS code K0733 is the Level II code for a power wheelchair accessory: a 12 to 24 amp hour sealed lead acid battery, billed each. Gel cell and absorbed glass mat (AGM) batteries both fall under it, as long as the rating sits inside that range.

CMS added the code on July 1, 2006, in the K range of temporary codes used by the DME MACs. It sits in the inexpensive or routinely purchased (IN) payment category, so suppliers bill it as a purchase. Coverage comes from the Wheelchair Options/Accessories LCD (L33792) and its policy article, A52504.

The word “each” sets the units. A chair that runs on two batteries gets one K0733 line with two units, never one unit for the pair.

Match the battery to its code before you reach for K0733

Wheelchair battery codes in the HCPCS code set split by seal, chemistry and size, so the label on the battery picks the code. K0733 is the capacity-range code for smaller sealed batteries. Larger sealed batteries are coded by their group size instead, and lithium has a code of its own.

K0108, the not-otherwise-specified wheelchair component code, is the wrong home for any of these. The DME MACs published a correct coding notice in July 2018 after suppliers billed K0108 for battery replacements.

Medicare pays for K0733 alongside the wheelchair base

Under policy article A52504, a sealed battery is separately payable from a power wheelchair base. That covers the batteries shipped with a new chair and the ones that replace them later. The charger works the other way, because its cost sits inside the base allowance.

These are the rules that decide whether a K0733 line gets paid:

• Up to two batteries are allowed at any one time, if the power wheelchair needs them.
• Only sealed batteries qualify. A non-sealed battery is denied as not reasonable and necessary.
• The battery charger (E2366 or E2367) is included in the base allowance. A dual mode charger supplied as a replacement is denied.
• A scooter (POV) allowance already includes its batteries at initial issue, so they are not billed separately then.
• A medically necessary replacement for a covered, beneficiary-owned POV is billed with a wheelchair accessory code.

The battery also inherits the chair’s coverage. A battery line can only carry KX when the wheelchair base meets the Power Mobility Devices LCD criteria. The battery has to meet its own criteria too.

Replacement K0733 batteries take the RB modifier

Many K0733 claims are replacements, because sealed batteries wear out well before the chair does. Policy article A52504 reserves RB for an accessory that replaces the same part after wear or damage.

Two limits apply. RB never goes on an upgrade, and it never goes on a battery supplied at the same time as the base. That holds even when the beneficiary had the same battery on a previous chair.

Here is how the modifiers line up on a battery claim:

• NU: a new battery, bought outright under the IN category.
• RB: a replacement for a worn or damaged battery on an existing chair.
• KX: the base meets its LCD criteria, and so does the battery.
• GA: the criteria are not met, and a valid Advance Beneficiary Notice (ABN) is on file.
• GZ: the criteria are not met, and there is no ABN.
• GY: the base fails its order requirements, or the item is only needed outside the home.

KX, GA, GY and GZ are never combined on one line. A line that carries none of them is rejected as missing information.

A worked K0733 replacement claim

Take a beneficiary who owns a covered power wheelchair that runs on two 12 V, 18 Ah AGM batteries. The chair stops holding a charge, both batteries fail a load test, and the supplier replaces the pair.

1. Confirm the code. 18 Ah sits inside the 12 to 24 Ah range, and AGM is a sealed type, so K0733 fits.
2. Set the units. Two batteries means one line with 2 units.
3. Add the modifiers. NU marks the purchase, RB marks the replacement, and KX confirms the chair and battery meet coverage criteria.
4. File the paperwork. The standard written order, the load-test note and signed proof of delivery all go on the record.
5. Leave the charger alone. The existing charger stays in service, and a dual mode replacement would be denied anyway.

The claim line reads K0733-NU-RB-KX, 2 units, and each piece answers a different question. Had the chair shipped new with those batteries, the line would drop RB and sit beside the base on the same claim.

Find the K0733 fee schedule amount at CMS

K0733 is priced on the CMS DMEPOS fee schedule, which CMS updates quarterly with amounts by state. Rural and non-rural areas can carry different amounts, so pull the figure for the beneficiary’s address.

Because the code sits in the IN category, the NU modifier pulls the purchase amount. Medicare pays 80% of the lower of the fee schedule amount or your charge, after the Part B deductible.

Medicare Advantage and Medicaid plans set their own rates and authorization rules. Run an insurance eligibility check before delivery rather than after the denial.

What to keep on file for a K0733 claim

A battery claim is reviewed against the same record any DMEPOS item needs, plus a few battery details. Keep these together for every K0733 delivery:

• A standard written order with the item description, quantity, order date and the ordering practitioner’s name and signature.
• The battery specification, meaning its voltage, amp hour rating and sealed type (gel cell or AGM).
• The make and model of the power wheelchair, and confirmation that Medicare covers it.
• For a replacement, the reason the old battery failed and the date the previous pair was supplied.
• Signed and dated proof of delivery that shows the quantity delivered.
• An ABN, if you expect Medicare to deny the battery and plan to bill the beneficiary.

An auditor will compare those records with the claim line. The broader rules are in our guide to medical billing compliance.

Why K0733 claims get denied

Most battery denials come from a handful of coding slips rather than coverage disputes. These are the ones that show up again and again:

• Too many units. A third battery on the same chair goes past the two-battery limit.
• A non-sealed battery. Wet lead acid batteries are denied, whatever code they are billed under.
• The wrong size code. A U-1, 22NF, group 24, group 27 or group 34 battery has its own E code.
• No KX, GA, GY or GZ. The line is rejected as missing information and has to be resubmitted.
• RB in the wrong place. RB on a battery shipped with a new base is an error, and so is a replacement without it.
• K0108 for a battery. The DME MACs treat it as incorrect coding when a specific battery code exists.
• A POV battery at initial issue. The scooter allowance already pays for it.
• An uncovered chair. If the base fails its own criteria, the battery line cannot carry KX.

A rejection is fixed and resubmitted, while a denial goes through redetermination. Our guide to denial management in healthcare covers how to track both.

Run this K0733 check before you submit

Five minutes against this list catches most of the denials above:

• The battery is sealed, and its rating is between 12 and 24 Ah.
• Units equal the number of batteries, and the chair holds no more than two.
• NU is on the line, with RB only for a replacement.
• Exactly one of KX, GA, GY or GZ is present.
• The standard written order, battery specification and proof of delivery are on file.
• No charger is billed with a new base.
• The base’s coverage status is confirmed.

Two code mix-ups to avoid

Is K0733 a Group 3 power wheelchair code? No. Group 3 bases run from K0848 to K0864, under the Power Mobility Devices LCD (L33789).

Are K0734 to K0738 related wheelchair bases? No. K0734 to K0737 are skin protection seat cushions, and K0738 is a portable gaseous oxygen system.

How claims management software keeps K0733 battery claims on track

Battery claims are small and frequent, so a rejected line can sit unnoticed until the beneficiary’s next order. Many offices track those lines in a spreadsheet beside the billing system.

Pabau, the practice management platform we build, includes claims management software that pre-fills the claim from the patient record. It checks required fields before a claim can be sent.

In the US, claims go through Claim.MD, with eligibility checks, claim status tracking and remittance posting in one place.

Code choice and modifiers stay with your billing team. Pabau keeps each K0733 line visible from submission to payment, so a rejection gets reworked while the order is still fresh.

Track every K0733 battery claim to payment

Pabau’s claims management software pre-fills claims from the patient record, checks required fields, and tracks each claim through to remittance.

Book a demo

Conclusion

K0733 is a narrow code, which is exactly why it trips suppliers up. Confirm the battery is sealed and rated 12 to 24 Ah, bill one unit per battery, and keep RB for replacements.

Get those three right and any remaining risk moves to the wheelchair base. Confirm its coverage before delivery, because a battery line can only carry KX when the chair qualifies.

Book a demo to see how Pabau tracks DME accessory claims from submission to payment.

Continue your research

Need to understand how clean claims reduce denial rates? Submitting a clean claim walks through the pre-submission requirements that apply across DMEPOS billing.

Looking for denial prevention best practices? Denial codes in medical billing explains the most common CARC and RARC codes and how to respond to each.

Want a broader foundation in revenue cycle management? What is revenue cycle management covers the end-to-end billing cycle from eligibility through payment posting.

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