US · guidance
CMS Pub. 100-02, ch. 6, § 10.1
Reasonable and Necessary Part A Hospital Inpatient Claim
Denials
(Rev. 182, Issued: 03-21-14, Effective: 10-01-13, Implementation: 04-21-14)
If a Medicare Part A claim for inpatient hospital services is denied because the inpatient
admission was not reasonable and necessary, or if a hospital determines under 42 CFR
§482.30(d) or §485.641 after a beneficiary is discharged that the beneficiary’s inpatient
admission was not reasonable and necessary, and if waiver of liability payment is not
made, the hospital may be paid for the following Part B inpatient services that would
have been reasonable and necessary if the beneficiary had been treated as a hospital
outpatient rather than admitted as an inpatient, provided the beneficiary is enrolled in
Medicare Part B:
1) Part B services paid under the outpatient prospective payment system (OPPS),
excluding observation services and hospital outpatient visits that require an
outpatient status. Hospitals that are excluded from payment under the OPPS are
instead paid under their alternative payment methodology (e.g., reasonable cost, all
inclusive rate, or Maryland waiver) for the services that are otherwise payable
under the OPPS.
2) The following services excluded from OPPS payment, that are instead paid under
the respective Part B fee schedules or prospectively determined rates for which
payment is made for these services when provided to hospital outpatients:
a. Physical therapy services, speech-language pathology services, and
occupational therapy services (see chapter 15, §§220 and 230 of this
manual, “Covered Medical and Other Health Services,”).
b. Ambulance services.
c. Prosthetic devices, prosthetic supplies, and orthotic devices paid under the
DMEPOS fee schedule (excludes implantable prosthetic devices (other
than dental) which replace all or part of an internal body organ (including
colostomy bags and supplies directly related to colostomy care) and
replacement of such devices).
d. Durable medical equipment supplied by the hospital for the patient to take
home, except durable medical equipment that is implantable.
e. Certain clinical diagnostic laboratory services.
f. Screening and diagnostic mammography services.
g. Annual wellness visit providing personalized prevention plan services.
Hospitals may also be paid under Part B for services included in the payment window
prior to the point of inpatient admission for outpatient services treated as inpatient
services (see Pub. 100-04, Medicare Claims Processing Manual, Chapter 4, §10.12,
“Payment Window for Outpatient Services Treated as Inpatient Services”), including
services requiring an outpatient status. The hospital can only bill for services that it
provided directly or under arrangement in accordance with Part B payment rules.
Outpatient therapeutic services furnished at an entity that is wholly owned or wholly
operated by the hospital and is not part of the hospital (such as a physician’s office), may
not be billed by the hospital to Part B. Reference labs may be billed only if the referring
laboratory does not bill for the laboratory test (see Pub. 100-04, Medicare Claims
Processing Manual, Chapter 16, §40.1, “Laboratories Billing for Referred Tests”).
The services billed to Part B must be reasonable and necessary and must meet all
applicable Part B coverage and payment conditions. Claims for Part B services submitted
following a reasonable and necessary Part A claim denial or hospital utilization review
determination must be filed no later than the close of the period ending 12 months or 1
calendar year after the date of service (see Pub. 100-04, Medicare Claims Processing
Manual, Chapter 1, §70 “Time Limitations for Filing Part A and Part B Claims”). See
Pub. 100-04, Medicare Claims Processing Manual, chapter 4, §240 for required bill
types.
History
(Rev. 182, Issued: 03-21-14, Effective: 10-01-13, Implementation: 04-21-14)
Provenance
- Source
- cms.gov
- Retrieved
- 2026-08-25
- Edition
- iom-2026-08-25
- Content hash
86b06f61ba1a3db23a66d9454250d68c65637e2285608b634e8e31f9edf547c5
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