Building rooms for in-house imaging, lab and procedures

Scope of this guide

This guide covers the construction side of adding a service. We are a construction contractor, not a billing, coding, compliance or legal adviser. Coverage, supervision, credentialing, licensing and the referral laws below determine what may be billed; confirm each with your billing professional and healthcare counsel before committing to a room.

In-office imaging, clinical laboratory and physical therapy are designated health services under the federal physician self-referral law (42 U.S.C. 1395nn). The in-office ancillary services exception in 42 CFR 411.355(b) (opens an external site) carries supervision, location and billing conditions, and referrals for MRI, CT and PET under that exception require a written notice to the patient listing alternative suppliers. New York's own self-referral statute, Public Health Law Section 238-a (opens an external site), covers clinical laboratory, pharmacy, radiation therapy, physical therapy and X-ray or imaging services, with an in-office exception of its own. The practice confirms its arrangement with counsel.

Order of decisions

• Select the equipment, or at least the model, and obtain the vendor's site-planning guide. Shielding, power, floor loading, cooling and data all follow the unit.
• Engage the design professionals the room requires: a qualified medical physicist for X-ray shielding, a licensed engineer for mechanical, electrical and structural work, and the architect of record for code and accessibility.
• Build the room to those drawings and the vendor's requirements, with inspections as the work proceeds.
• The practice applies for the registration, certificate or accreditation that the service requires, and completes any inspection or survey after installation.
• Payer enrollment and credentialing, handled by the practice and its billing professional.

We provide the construction documentation those applications ask for, such as as-built drawings and equipment locations.

Requirements by room

The code families are listed only to identify the service area. Whether any code may be billed by a given practice depends on coverage, supervision, credentialing, licensing and the referral laws described above, and should be confirmed with the practice's billing professional and counsel.

Shielded X-ray rooms

Shielding for walls, doors and the viewing window is designed by a qualified medical physicist licensed in New York, typically using NCRP Report No. 147. The design depends on the unit's workload and on what occupies the adjacent spaces, so moving a waiting room or office next to the X-ray wall after the design is complete changes the shielding. The operator's booth or barrier must give the operator a view of the patient and voice contact (10 NYCRR 16.56 outside the city; Health Code 175.46 (opens an external site) in New York City). We have built out a radiology imaging center and a dental office. For the dental office's X-ray unit, the physicist's shielding evaluation found that no added shielding was needed; that determination is made case by case for each room and unit, and a different room or unit can require shielding.

In New York City, a facility must hold a certificate of registration from the Department of Health and Mental Hygiene before operating X-ray equipment, although a qualified medical physicist may install equipment for testing. The application includes the physicist's report of initial quality assurance tests and a radiation protection survey of each room housing a radiographic unit. Outside the city, the operator applies to the State Department of Health (opens an external site) between 60 and 30 days before the installation is established. Neither rule sets a separate shielding-plan approval before construction; the physicist's design and post-installation survey go with the registration. Confirm current procedure with the agency. Advanced imaging adds a payment condition: Medicare pays the technical component of CT, MRI, nuclear medicine and PET only to accredited suppliers, and mammography requires FDA MQSA certification, so the accreditor's room and equipment requirements belong in the design.

Office laboratories

New York regulates laboratories in two tracks. A laboratory owned and operated by the practice's own licensed practitioners and testing only their patients is exempt from the state clinical laboratory permit and instead holds a federal CLIA certificate (waiver, provider-performed microscopy, or compliance or accreditation), which it applies for with form CMS-116 through the Wadsworth Center's Physician Office Laboratory Evaluation Program (opens an external site). Other laboratories need a New York State clinical laboratory permit. Lab claims are paid only with a CLIA number that covers the complexity of each test billed, so the certificate should be in hand before the analyzer goes into service. A room cannot be CLIA-compliant in itself; the certificate belongs to the laboratory, and the test complexity follows the FDA categorization of each analyzer.

The room needs a readily accessible hand-washing sink, a quick-drench eyewash within the work area where corrosive materials are used (29 CFR 1910.151(c)), cleanable chemical-resistant counters, and stable temperature with dedicated circuits for analyzers. Special biohazard ventilation and plumbing interceptors are not general requirements for an office laboratory and are included only where the engineer specifies them.

Procedure rooms and infusion bays

A hand-scrub sink inside a small procedure room often consumes the accessible clear floor space beside the table, so we usually place it outside or adjacent to the door. The NYC Mechanical Code (Section 407.1) does not adopt ASHRAE Standard 170 for ambulatory care facilities; the engineer of record sets the ventilation design basis, and where ASHRAE 170 is chosen, it sets the pressure, air change and filtration values for the room. Piped medical gas falls under NFPA 99; offices more commonly use portable cylinders, subject to FDNY rules in the city.

Office-based surgery accreditation under Public Health Law 230-d applies where procedures require moderate or deep sedation or general anesthesia, and to any liposuction. Sedation also changes the building. In New York City, a space where patients are rendered incapable of self-preservation is an ambulatory care facility, and under Building Code Section 422.2, where four or more such patients may be present at a time, it must be separated from adjacent spaces and corridors by a fire partition. New York's surgical smoke evacuation law covers general hospitals and ambulatory surgery centers, not physician offices (NYS DOH DAL 23-05 (opens an external site)), although local evacuation remains good practice.

For infusion, line of sight from a staff station is an operational and safety decision rather than a legal requirement. Medicare's direct supervision rule requires the supervising practitioner to be immediately available, and since January 1, 2026 permits presence through real-time audio and video for many services; the practice's billing professional confirms how it applies. Hazardous drug infusion under USP chapter 800 requires a different room design.

Telehealth, therapy and audiology rooms

Acoustic separation fails at its weakest element, such as a door undercut, a partition that stops at the ceiling, or electrical boxes set back to back. Telehealth and behavioral health rooms need partitions carried to the deck, a gasketed solid-core door and sound masking in the adjoining corridor. A therapy gym needs blocking for suspension trainers and pulleys designed by an engineer before the ceiling closes. Audiology booths are sized from a site noise survey; a floating floor is needed only where the measured noise requires it.

We map each planned room against the vendor's site guide and the design professionals' drawings, and price it before the practice commits. The electrical, plumbing, HVAC and low-voltage work is performed by our licensed partner contractors.