US · guidance
CMS Pub. 100-04, ch. 19, § 100.5.1
A/B MAC (A) - Outpatient - Medicare Part B - Claims
Processing
(Rev. 2075, Issued: 10-28-10, Effective: 01-01-10, Implementation: 01-28-11)
All charges, except for therapies, telehealth originating site facility fee, PPV, influenza
virus vaccine, hepatitis B vaccine and hospital-based ambulance services are combined
and reported under revenue code 0510 (clinic visit) on TOB 13X (hospital outpatient).
Regardless of the number of times a patient is seen in a given day at a particular IHS
provider, the outpatient services should be billed only once (i.e., all-inclusive). An
exception is when a patient is seen for a clinic visit, then returns to the emergency room
later on the same day, at the same provider, for an unrelated condition (or vice versa).
Two clinic visits may be billed in this instance. The remarks section of the bill shall
include a narrative describing the situation and why two clinic visits are being billed.
When a medical visit and an emergency visit occur on the same day, condition code G0
(distinct medical visit) shall be reported on the claim.
While at least one face-to-face encounter with a physician or non-physician practitioner is
required for an initial visit to count as a billable encounter, the same is not always true of
return visits to obtain follow-up care ordered by the physician or non-physician
practitioner during the initial visit. If a physician or non-physician practitioner orders a
specific procedure or test which cannot be furnished until a later date after the date of the
initial visit with the physician or non-physician practitioner, and the procedures or tests
are medically necessary, then it is appropriate for the return encounter to be billed on the
date the procedure or test is furnished and for the provider to receive an additional AIR
payment even if the beneficiary did not interact with a physician or non-physician
practitioner during the return visit.
Examples of medically necessary reasons for return visits would include a requirement
that the beneficiary fast for 12 hours prior to an ordered test, or that a chest X-ray be
provided two weeks following the initiation of antibiotic treatment for pneumonia. In
addition, if a beneficiary must return on another day for a medically necessary test
ordered during an initial visit because the test cannot be performed on the day it is
ordered due to provider or patient constraints that cannot be overcome, the return visit
would be considered medically necessary.
See Chapter18, §10 of Pub. 100-04, Medicare Claims Processing Manual, for detailed
billing instructions for vaccines. Chapter 12 of Pub. 100-04 contains detailed billing
instructions for outpatient therapy services provided by an occupational or physical
therapist. See Chapter15 of Pub. 100-04 for detailed billing instructions for ambulance
services.
The MSN is suppressed.
History
(Rev. 2075, Issued: 10-28-10, Effective: 01-01-10, Implementation: 01-28-11)
Provenance
- Source
- cms.gov
- Retrieved
- 2026-08-25
- Edition
- iom-2026-08-25
- Content hash
db396366cfa23164deb3f6c966213b383a9240b900c90ac604dcedd11317d731
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