By Cyber Sense Billing Team · Published · Updated
What an IDTF is
An independent diagnostic testing facility, or IDTF, is a Medicare supplier type for entities that perform diagnostic tests independently of a physician office or hospital. Freestanding imaging centers, mobile imaging units, and some sleep testing or cardiac monitoring companies often enroll as IDTFs. Medicare imposes specific performance standards on IDTFs under federal regulation, and enrollment is more involved than for a physician group. Imaging centers that fail to meet or maintain these standards may face enrollment denial or revocation, which stops Medicare payments entirely.
The enrollment application
IDTFs enroll with Medicare using the CMS-855B application through PECOS, along with an IDTF attachment that lists each test the facility will perform, the equipment used, the supervising physicians and their level of supervision, and the technologists and their credentials. The application must list each practice location. Mobile units have additional requirements. The Medicare Administrative Contractor reviews the application and typically conducts a site visit before approval.
Performance standards
Federal regulations at 42 CFR 410.33 describe IDTF performance standards. They include operating in compliance with federal and state licensure, providing complete and accurate information on the enrollment application, maintaining a physical facility with appropriate space, having comprehensive liability insurance, accepting referrals only from treating physicians, answering beneficiaries' questions and maintaining records of complaints, openly posting the standards, enabling CMS site visits, and not sharing space, equipment, or staff with other Medicare enrolled entities except as permitted. Each standard must be met continuously, not only at enrollment.
Supervising physicians
Each diagnostic test performed by an IDTF must be supervised at the level Medicare requires for that test: general, direct, or personal supervision. The IDTF must list supervising physicians who are qualified for the tests they supervise, and their proficiency may need to be documented. Supervising physicians are limited in how many IDTF sites they can supervise. Changes in supervising physicians must be reported to the contractor promptly.
Technologists and equipment
IDTF technologists must meet state licensure requirements or be certified by an appropriate credentialing organization for the tests they perform. Equipment must be maintained and calibrated per manufacturer recommendations, with records available during site visits. Advanced diagnostic imaging, such as MRI, CT, and nuclear medicine, requires accreditation by a CMS-approved organization for suppliers of the technical component under Medicare.
Ordering requirements
Medicare requires that IDTF tests be ordered in writing by the treating physician or practitioner, and the IDTF may not add tests without a new order, except in limited circumstances described in the regulations. Orders and supporting documentation should be retained. Self-referral rules also apply to physician ownership of IDTFs, so ownership arrangements should be reviewed with counsel.
Reporting changes
IDTFs must report changes in ownership, location, general supervision, and adverse legal actions within short timeframes, often 30 days, and other changes within 90 days. Missing these deadlines can lead to revocation. Keep a change log and assign responsibility for reporting.
Commercial payer credentialing
Commercial plans may contract with imaging centers as facilities or under radiology benefit managers. They may require accreditation, specific equipment standards, and credentialing of reading radiologists separately. Plan your commercial enrollment alongside Medicare so the center can see patients from the main plans in your area when it opens.
Preparing for site visits
Contractor site visits may be unannounced. Before and after enrollment, make sure posted hours are accurate, signage is visible, the IDTF standards are posted, equipment and calibration records are available, staff credentials are on file, and supervising physician arrangements are documented. Failing a site visit because the facility was closed during posted hours is a common and avoidable problem.
Billing after enrollment
Once enrolled, an IDTF bills Medicare on professional claims using the CPT codes for the tests it performs, typically the technical component with modifier TC, or the global service when it also employs or contracts the interpreting physician under an arrangement that permits global billing. When an IDTF bills for an interpretation performed by an outside physician, Medicare anti-markup rules may limit payment to the lower of certain amounts, and the claim must identify the performing physician. The ordering provider's NPI must be on each claim, and Medicare checks that the ordering provider is enrolled or registered. IDTFs should also confirm that each test billed was listed on their enrollment attachment, because billing a test not listed can result in denials. Accurate place of service codes and service locations, matching enrollment, are equally important. Mobile IDTFs have specific billing rules depending on the setting where the patient is tested.
Frequently asked questions
Do radiology groups need IDTF enrollment?
Not if they bill as a physician group and perform tests in a physician office setting that meets group rules. Freestanding imaging centers billing independently often enroll as IDTFs.
How long does IDTF enrollment take?
It varies by contractor and application completeness, including site visit scheduling. Start well before opening.
Is accreditation required?
Accreditation is required for advanced diagnostic imaging technical components billed under Medicare.
Can an IDTF share space with a physician office?
Space and equipment sharing is restricted under the IDTF standards. Review the regulations before planning shared arrangements.
Sources and further reading
Need help with radiology billing? See our Radiology medical billing services.
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This article is general information, not legal or coding advice. Always check current CPT®, ICD-10-CM, CMS and payer guidance. Questions? Contact us.