The lease is signed, the build-out finishes, and the first patients are seen at the new address. The NPI does not change. The location does, and that one fact touches four separate records that update on four different clocks. Medicare wants the change within 30 days, and the first claims from the new site often pay at the old site’s rates because the payment locality comes from the ZIP code on the claim.
What this covers
- A change, addition or deletion of a practice location is a reportable event, due to the Medicare contractor within 30 days under 42 CFR 424.516(d)(1)(iii).
- Billing privileges at a new location date from the later of the enrollment filing date or the first date of service there, per 42 CFR 424.520(d), so file before the first patient.
- A new address does not need a new NPI. The NPI stays with the provider or the organization while the enrollment record and every payer contract carry the location.
- Medicare prices a code by the payment locality where the service was furnished, taken from the ZIP code on the claim (Pub 100-04, chapter 1, section 10.1.1).
- Each commercial payer answers to its own contract language, and payers grant no retroactive effective date for a location added late.
One address change, four records, and not one of them shares a deadline.NPPES, Medicare, state Medicaid and each commercial contract each hold the practice address on their own terms.
What follows is built from the sources a practice can check for itself: the enrollment regulation, the CMS-855 forms, the claims processing manual, a MAC’s published processing timeframes, a payer’s provider manual and a state Medicaid agency’s instructions. Read it before the lease is signed rather than the week the doors open.
What a new address changes, and what it does not
The NPI belongs to the provider or the organization, not to a street address. NPPES lets an individual or an organization record more than one practice location, and only the primary location is required. A second office therefore starts with an updated NPPES record, not a new identifier.
What does change is the enrollment record and every contract that names the old address. Four systems hold that address, and each one has its own owner and its own clock.
| Record | What changes | Who files it | Clock |
|---|---|---|---|
| NPPES | The practice location address, and the taxonomy tied to the site | The practice, in NPPES | Within 30 days of the change, 45 CFR 162.410(a)(4) |
| Medicare enrollment | An added, changed or deleted practice location | The authorized official, in PECOS or on the CMS-855 | Within 30 days, 42 CFR 424.516(d)(1)(iii) |
| State Medicaid enrollment | The service location on the state provider file, or a new location record | The provider, through the state portal or a written request | Set by the state |
| Commercial payer contracts | A location amendment under the existing agreement, or a separate location agreement | Credentialing or network staff | Set by the contract and the payer’s manual |
DMEPOS suppliers are the exception to the one-NPI rule. CMS requires each practice location to be named as a subpart, and each subpart to have its own NPI.
The date that sets your first billable day at the new site
42 CFR 424.520(d) fixes the effective date of billing privileges for physicians, nonphysician practitioners and their organizations at the later of two dates: the filing date of the enrollment application that was later approved, or the date the provider first began furnishing services at the new practice location. The later date governs.
That is why section 4A of the CMS-855B asks for the date you saw or will see your first Medicare patient at the location. Report the real date. If the first patient at the new site is seen in March and the change of information is filed in June, the June filing date controls, and the March visits sit outside the billing privileges attached to that location.
Do not open the new site’s Medicare schedule ahead of the filing. The effective date rule puts the filing date ahead of everything the practice did earlier, and those earlier dates of service are the ones that deny.
- The street address exactly as the Postal Service records it, never a post office box, a commercial mailbox or a drop box
- CLIA certificates and FDA mammography certifications for any location where those apply
- A current EFT authorization agreement if banking or the pay-to address is changing
- A certification statement signed and dated by an authorized official
- Practice locations inside a second MAC’s jurisdiction go on a separate application to the MAC that serves that area
Which form to file, and whether the fee applies
The organization enrolls on the CMS-855B with a Type 2 NPI. The individual physician or nonphysician practitioner enrolls on the CMS-855I. A group’s practice locations are reported in section 4A of the 855B, and when a clinician joins the group at the new site, the reassignment that lets the group bill for that work goes on the 855I, because CMS discontinued the CMS-855R.
| Situation | Form | 2026 fee |
|---|---|---|
| Group practice adding a location in the same MAC’s area | CMS-855B change of information | None. Physician and NPP organizations are not institutional providers |
| Physician or NPP joining the group at the new site | CMS-855I with the reassignment sections | None |
| Practice opening a location in a different MAC’s jurisdiction | A separate CMS-855B or CMS-855I to the MAC that serves that area | Depends on the provider type |
| Institutional provider adding a practice location | Its own CMS-855 form | $750, per the CY 2026 fee notice |
The distinction between adding a location and changing one decides the fee. Chapter 10 of the Program Integrity Manual states that adding a practice location may require an application fee for applicable institutions, while changing a practice location does not.
For a group address change, Novitas directs providers to complete sections 1, 2A, 3, 4A, 12, 13 (optional) and 15 of the 855B. A development request that follows gives the practice 30 days to answer under 42 CFR 424.525(a)(1), and an unanswered request can end in a rejection that carries no appeal rights.
Why the first month can pay at the old location’s rates
Medicare sets the payment locality from the place where the service was furnished, and it takes that place from the ZIP code on the claim. Chapter 1, section 10.1.1 of the claims processing manual directs the MAC to use the ZIP code of the location where the service was rendered to determine both jurisdiction over the claim and the correct payment locality. Item 32 of the CMS-1500 carries that name, address and ZIP code.
Every locality has its own geographic practice cost indices, one each for work, practice expense and malpractice, and CMS multiplies the relative value units by those indices before the conversion factor. A practice that keeps billing the old address for services furnished at the new site is priced on the old locality. That can pay more or less than the new area pays, and either way it is not the locality where the service happened. Run your highest-volume codes through the CMS Physician Fee Schedule look-up tool for the new locality before the lease is signed.
A second failure costs more time than money. When a group has offices in more than one payment locality and the claim does not identify the location where the office-based service was performed, the MAC returns or rejects the claim as unprocessable. A service location left off the claim is also the trigger for remark code MA114. One claim carries one service location, and a separate claim is required when more than one is needed.
- Split claims by the effective date: dates of service before it belong to the old location, dates on and after it belong to the new one.
- Report the nine-digit ZIP code for the new address where the locality rules call for it, and keep place of service 11 for office visits.
- Confirm the new location shows in the enrollment record before the first claim from it goes out.
- Update the payer directory and the medical billing team’s claim defaults at the same time, or the old address returns on autopilot.
Medicaid and commercial payers run on their own clocks
There is no national Medicaid enrollment. Each state keeps its own provider file and its own maintenance process. Colorado’s Medicaid agency tells providers to add a location through Provider Maintenance in the provider portal and states plainly that providers should not submit a new enrollment application for it. South Carolina takes address changes by written request on business letterhead rather than through a portal. Find the state’s own instruction before assuming the Medicare path applies, and expect the request to be handled by a person rather than a queue.
Commercial payers answer to contract language. Medica’s provider manual requires contracted providers to request a new office or practice location in writing, in advance, and states that no retroactive effective dates are granted. A practitioner cannot see members or have claims submitted until credentialing is approved. Our credentialing team keeps that request, the payer’s answer and the effective date in one file per location.
Two clocks sit underneath those contracts. CAQH ProView requires the provider to re-attest every 120 days, or every 180 days in Illinois, and the profile status changes to Expired the day after the deadline, at which point a payer pulling the profile cannot move the file. NCQA requires recredentialing every three years, and Medicare Advantage rules require the same cycle for network practitioners at 42 CFR 422.204(b)(2)(ii).
- Add the new address to the CAQH profile and re-attest before anything is sent to a payer.
- File the CMS-855I reassignment for each clinician alongside the group’s 855B, because both records must be enrolled for the reassignment to take effect.
- Confirm the clinician’s state license covers the new site if it sits across a state line.
- Ask each payer whether the location is amended under the existing contract or needs its own agreement.
- Hold the go-live date until the payer confirms credentialing, since payers do not backdate it.
The sequence that keeps the calendar honest
Add the practice location in NPPES and keep the primary location accurate. Do this first, because the enrollment systems compare against it.
Submit the 855B change of information in PECOS with the new location, the first-patient date and the supporting documents, dated before the first Medicare patient is seen there.
For each clinician who will bill through the group at the new site, file the CMS-855I reassignment. Both the group record and the individual record must be enrolled for it to take effect.
Use the state’s maintenance process rather than a new enrollment, and ask whether the state needs a location-specific identifier.
Request the location in advance, ask for the effective date in writing, and refresh the CAQH attestation so the file can move.
Set the new service facility address in the billing system along with EDI, ERA and EFT details, then diarize the 30-day windows for every report you filed.
New location questions from billing managers
No. The NPI is assigned to the provider or the organization, not to a location, and NPPES accepts more than one practice location on a record. What changes is the enrollment record and each payer contract that names the old address. DMEPOS suppliers are the exception, because CMS requires each of their locations to be named as a subpart with its own NPI.
CMS defines the timeframes and the MACs publish them. Novitas lists 95 percent of PECOS change-of-information applications that need no site visit, development or fingerprinting as completed within 15 calendar days of receipt, and 100 percent within 50. Paper filings run 95 percent within 30 days and 100 percent within 65.
The effective date is the later of the filing date of the approved application or the date the practice first furnished services at the new location, under 42 CFR 424.520(d). File before the first Medicare patient is seen and the first date of service governs. See patients first and the filing date governs instead.
The payment locality comes from the ZIP code in item 32 of the claim, which is the location where the service was furnished. If claims still carry the old address, the MAC prices them on the old locality’s geographic indices. That can pay more or less than the new area, and one claim carries one service location.
Yes. When the new location sits in another Medicare Administrative Contractor’s jurisdiction, both the CMS-855B and the CMS-855I direct the practice to enroll with the MAC that serves that area on a separate application. Claims for services furnished there are processed by that MAC at that area’s locality.
No. Medicaid is administered state by state, and each state runs its own provider file and its own maintenance process. Colorado’s agency directs providers to update a service location through Provider Maintenance rather than filing a new enrollment, while South Carolina takes address changes by written request. Check the state’s own instruction first.
The bottom line
A new location is an enrollment event at every payer, and the dates that decide the outcome are the ones the practice controls: when the change is filed, when the first patient is seen and which address goes on the claim. File before the first visit, keep one calendar for the 30-day windows, and the first month at the new site pays on the new locality’s rates.
Opening a second site this year?
We run the enrollment and credentialing side of a new location: the PECOS change of information, CMS-855I reassignments, state Medicaid maintenance, payer location notices and CAQH attestation calendars. Our revenue cycle team will map every record that carries your address and show you which ones are already late.
Request a free new-location enrollment auditThis article describes federal Medicare enrollment rules and the payer and state processes named in the sources; state Medicaid requirements, payer contracts and accreditation standards add their own terms.
