A4575 — Topical hyperbaric oxygen chamber, disposable
HCPCS/CPT
Prior Authorization
No Prior Auth Required
Code is covered without prior authorization (high confidence)
Medicare Pricing
Work RVU
0.00
Facility
N/A
Non-Facility
N/A
Documentation Required
- When billing for denial of related physician services on a Part B claim, enter '99199-related to Topical HBO' in the comment/narrative field (Loop 2400 or SV101-7 for the 5010A1 837P Item 19 and in Item 19 for paper claims).
- Reference CMS guidance: Change Request 10220, Transmittal 203, Transmittal 3921, and Internet-Only Manual Pub 100-04 Claims Processing Manual Chapter 32 Section 30.2 for policy authority and specific procedural/billing instructions.
- This article provides billing and coding guidance that complements LCD L37873; any required medical documentation, prior authorizations, or specific claim forms are detailed in L37873 and should be referenced for claims submission.
- A Standard Written Order (SWO) must be communicated to the supplier before a claim is submitted; for DMEPOS base items requiring a Written Order Prior to Delivery (WOPD), the supplier must receive a signed WOPD before delivery or the claim will be denied.
Key Coverage Criteria
- Topical oxygen therapy for chronic wounds is not covered by a National Coverage Determination; coverage determination is made by the local Medicare Administrative Contractor (MAC).
- This billing and coding article does not itself define clinical indications; follow the Topical Oxygen Therapy Local Coverage Determination L37873 for covered clinical indications for topical oxygen therapy.
- Initial coverage for home oxygen and oxygen equipment is reasonable and necessary only if the treating practitioner ordered and evaluated a qualifying blood gas study performed at the time of need, the study meets the coverage criteria, the study was performed by a treating practitioner or qualified provider/laboratory, and provision of home oxygen is expected to improve the beneficiary’s condition.
- Group I: Coverage if arterial PO2 ≤ 55 mm Hg or arterial oxygen saturation ≤ 88% at rest (awake) breathing room air.
- Group I (sleep-only): Coverage if arterial PO2 ≤ 55 mm Hg or arterial oxygen saturation ≤ 88% during sleep for a beneficiary who demonstrates PO2 ≥ 56 mm Hg or saturation ≥ 89% while awake, with oxygen reasonable and necessary only during sleep.
- Group I (sleep desaturation from baseline): Coverage if during sleep PO2 decreases >10 mm Hg or oxygen saturation decreases >5% from baseline and the decrease is associated with hypoxemia symptoms (e.g., cognitive impairment, nocturnal restlessness), with oxygen reasonable and necessary only during sleep.
19 Active Policies
L33797 — Oxygen and Oxygen Equipment
J19
AETNA-CPB-0172 — Hyperbaric Oxygen Therapy (HBOT)
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Related Codes
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