Knowledge Base Article

Medicare can be fastidious – picky, particular, specific, precise, even downright finicky in their coding, billing, and documentation requirements. By now, most of us are used to their demands for precision. For example, we are all aware that the units billed must match the dosage, amount, or time specified in the physician’s order. But in the July 2015 OPPS Update, CMS points out an instance related to hyperbaric oxygen treatments (HBO) where this does not hold true.

When a physician orders a 90-minute HBO treatment, he or she expects that the patient will be placed at 100% oxygen for 90 minutes. In billing for HBO treatments, providers are allowed to include not only the time at 100% oxygen but also the time for descent, air breaks, and ascent. In that case, the units billed for HBO will be greater than the units equivalent to the 90 minutes specified in the order.

Effective January 1, 2015, CMS discontinued the old code that had been used to report HBO for years (C1300) and replaced it with new HCPCS code G0277 which has the same description as the old code - Hyperbaric oxygen under pressure, full body chamber, per 30 minute interval. Here are the key points to keep in mind when billing G0277 for HBO services:

• The total number of billable 30-minute intervals would not be based solely on the amount of time noted on the physician order.
• The total number of 30-minute intervals billable under G0277 should be calculated by including:
• Time spent by the patient under 100% oxygen,
• Time for descent,
• Time for air breaks, and
• Time for ascent.
• You must go at least 16 minutes into the next 30-minute interval in order to bill an additional unit. For example:
• 46-75 minutes = 2 units
• 76-105 minutes = 3 units
• 106-135 minutes = 4 units
• HBO is typically prescribed for an average of 90 minutes (at 100% oxygen)
• A common scenario to fulfill an HBO order for 90 minutes of treatment would be 90 minutes of therapeutic HBO, 10 minutes descent, 10 minutes air breaks and 10 minutes ascent for a total of 120 minutes which would equal 4 units of G0277.
• In general, CMS does not expect that a physician order for 90 minutes of HBO therapy would exceed 4 billed units of HCPCS code G0277.

And one more thing Medicare is picky about is their coverage requirements. In addition to getting the correct units on the claim, providers need to be sure the patient qualifies for HBO services in accordance with Medicare’s National Coverage Determination and any Local Coverage Determinations or Articles. The NCD for Hyperbaric Oxygen Therapy (20.29) includes a long list of covered conditions and an even longer list of non-covered indications. HBO is used as an adjunctive treatment and /or after conventional therapy has failed for a number of the covered conditions so review the policy carefully. Be sure that documentation in your medical record provides the details of any conservative or standard treatments in order to support the use of HBO as an adjunctive therapy.

HBO covered conditions include:

1. Acute carbon monoxide intoxication,
2. Decompression illness,
3. Gas embolism,
4. Gas gangrene,
5. Acute traumatic peripheral ischemia. HBO therapy is a valuable adjunctive treatment to be used in combination with accepted standard therapeutic measures when loss of function, limb, or life is threatened.
6. Crush injuries and suturing of severed limbs. As in the previous conditions, HBO therapy would be an adjunctive treatment when loss of function, limb, or life is threatened.
7. Progressive necrotizing infections (necrotizing fasciitis),
8. Acute peripheral arterial insufficiency,
9. Preparation and preservation of compromised skin grafts (not for primary management of wounds),
10. Chronic refractory osteomyelitis, unresponsive to conventional medical and surgical management,
11. Osteoradionecrosis as an adjunct to conventional treatment,
12. Soft tissue radionecrosis as an adjunct to conventional treatment,
13. Cyanide poisoning,
14. Actinomycosis, only as an adjunct to conventional therapy when the disease process is refractory to antibiotics and surgical treatment,
15. Diabetic wounds of the lower extremities in patients who meet the following three criteria:
16. Patient has type I or type II diabetes and has a lower extremity wound that is due to diabetes;
17. Patient has a wound classified as Wagner grade III or higher; and
18. Patient has failed an adequate course of standard wound therapy.

A 2014 review of HBO claims by Medicare’s Supplemental Medical Review Contractor revealed an error rate of 58%. Although over half of the denials were for lack of response to the document request, other medically reviewed claims lacked documentation in the submitted medical records to support the HBO services as medically reasonable and necessary. The documentation did not include:

• Specific timelines and goals for therapy. For example, the documentation simply stated “continue HBO” or “until healed”
• Radiology and pathology reports confirming diagnosis such as osteomyelitis or gas gangrene
• Monitoring for improvement or lack of improvement

In addition, when documentation was provided, descriptions of diabetic wounds did not meet Wagner Criteria for Grade three (III) or four (IV) wounds and therapy was provided beyond the 30 days allowed under Medicare coverage guidelines.

So before you bill for HBO make sure your patients meet the criteria for coverage and that you correctly calculate the number of units to report. If not, picky Medicare may decide to “pick” on you!