Medicare Claims Processing Manual (Pub. 100-04), Ch. 2 § 90.3
Source of Admission - Outpatient Hospital
90.3 - Source of Admission - Outpatient Hospital
(Rev. 1472, Issued: 03-06-08, Effective: 05-23-07, Implementation: 04-07-08)
The hospital’s registration process must distinguish whether the referral source for this
registration/admission is from:
• Its own inpatient hospital;
• An encounter in another hospital (see §90.6 for definition of encounter); or
• Any other source - See chapter 25.
Hospitals must determine the appropriate source of admission from internal records or by
asking the patient who referred him/her, and whether the referral took place as a result of
an encounter in the servicing hospital, another hospital, or elsewhere.
The following coding must be used on the outpatient claim. Therefore
admission/registration processes must obtain the information.
1. Physician Referral - The patient was referred to this facility for outpatient or
referenced diagnostic services by his/her personal physician, or the patient
independently requested outpatient services (self-referral).
2. Clinic Referral - The patient was referred to this facility for outpatient or
referenced diagnostic services by this facility’s clinic or other outpatient
department physician.
3. HMO Referral - The patient was referred to this facility for outpatient or
referenced diagnostic services by an HMO physician.
4. Transfer from a Hospital - The patient was referred to this facility for outpatient
or referenced diagnostic services by a physician of another acute care facility.
5. Transfer from a SNF - The patient was referred to this facility for outpatient or
referenced diagnostic services by a physician of the SNF where the patient is an
inpatient.
6. Transfer from Another Health Care Facility - The patient was referred to this
facility for outpatient or referenced diagnostic services by a physician of another
health care facility where the patient is an inpatient.
7. Emergency Room - The patient was referred to this facility for outpatient or
referenced diagnostic services by this facility’s emergency room physician.
8. Court/Law Enforcement -The patient was referred to this facility for outpatient or
referenced diagnostic services upon the direction of a court of law, or upon the
request of a law enforcement agency representative.
9. Information not available.
10. Transfer from a CAH - The patient was referred to this facility for outpatient or
referenced diagnostic services by (a physician of) the CAH were the patient is an
inpatient.
The hospital must determine the proper source of admission code based on the patient’s
response and/or any other information the hospital may have available from its
preregistration records or scheduling data. The hospital must enter the proper source of
admission code on the claim.
NOTE: Information regarding the form locator number that corresponds to the source of
admission code and a table to crosswalk its CMS-1450 form locator to the 837
transaction is found in Chapter 25.
If the patient was referred for services by a physician at:
• This hospital, the hospital enters codes 2 or 7;
• Another hospital, the hospital enters code 4; or
• Some other source, the hospital enters codes 1, 3, 5, 6, 8, 9, or A, as appropriate.
If the hospital is sure the admission source is not from its hospital or another hospital but
cannot determine which of the codes apply, the hospital will enter code 1 on Medicare
claims. However, incorrect reporting where services were referred by staff at its own
hospital or another hospital (codes 2, 4, or 7 are applicable) is considered program abuse
and subject to applicable sanctions.