NPI Type 1 vs Type 2: Which One Does Your Practice Need

NPI Type 1 vs Type 2 comes down to one question: are you enumerating a person or a business? Type 1 identifies you as an individual clinician and you only ever get one. Type 2 identifies an organization that bills, and an organization can hold several. Incorporate, and you need both.

The rules behind that answer are short and public. Below: what CMS actually enumerates, the practice structures that decide your case, what a Type 2 application demands that a Type 1 does not, where each number lands on a claim, and the one rule that settles arguments with payers.

NPI Type 1 vs Type 2 is a question of legal structure, not practice size

The size of your practice has nothing to do with it. CMS enumerates people as Entity Type 1 and organizations as Entity Type 2. A solo physician in a one room office and a partner in a 400 provider group both hold exactly one Type 1, and neither of them holds a Type 2 as a person.

The CMS NPI Fact Sheet puts it plainly. Type 1 covers individual health care providers, including physicians, nurse practitioners and sole proprietors. Type 2 covers organizations: hospitals, nursing homes, physician groups. The National Plan and Provider Enumeration System, better known as NPPES, assigns entity type code 1 to the first group and entity type code 2 to the second.

The term that trips people up is sole proprietor. A sole proprietorship is a business. It can have employees, several offices and its own EIN. In NPPES it is still an individual, because the owner and the business are not separate legal entities. CMS says so in the application instructions and adds a warning most readers skip past: being a solo practitioner does not make you a sole proprietor, and being a sole proprietor does not mean you practice alone.

A sole proprietorship is a business. In NPPES it is still a person, and a person gets one number.

Incorporate and the picture changes in one step. File a PC, a PLLC or an LLC and you have created a second legal entity that files its own tax return. You keep your Type 1. The entity you formed gets its own Type 2, and CMS names corporations and LLCs specifically.

You get one Type 1 for life, and an organization can hold many

An individual gets exactly one NPI, no matter how many state licenses, taxonomy codes or practice locations they collect. Organizations work the other way. A health system can hold a Type 2 for itself and a separate Type 2 for every subpart that sends standard transactions on its own.

This sits in the regulation rather than in policy that shifts. Under 45 CFR 162.408, the enumeration system assigns a single unique NPI to a health care provider, deactivates it on the death of an individual or the dissolution of an organization, and never assigns a deactivated number to anyone else. The number is 10 digits with a check digit in the tenth position and carries no information about you. It outlives your job, your address and your specialty.

Organizations get the opposite treatment because of subparts. A subpart is a component or a separate location of an organization that furnishes health care without being its own legal entity. CMS lists the ordinary examples: a hospital laboratory, a psychiatric unit, an outpatient department sitting off the main campus, each location of a pharmacy chain. Subparts are assigned Type 2 numbers, and a subpart that bills on its own is required to have one.

Deadline watch: covered providers have 30 days to report a change to their NPPES record, whether that is a Type 1 practice address or a Type 2 legal business name. The clock is written into 45 CFR 162.410(a)(4), and payers notice a stale record long before CMS does.

Which one you need comes down to how the practice is set up

Six structures cover almost every physician in the country. Employed clinicians and sole proprietors need a Type 1 and nothing else. Incorporated solo practices, partnerships and groups need both. Hospitals need a Type 2 for the entity and another for each subpart that sends its own transactions.

Two rows there deserve a note. An employed physician never applies for a Type 2, because the employer already holds one and the hospital name on the claim is not yours to enumerate. And a provider who stays outside HIPAA standard transactions is not required to hold an NPI at all, though the rule allows one voluntarily. Few stay outside for long, since payers, hospitals and state programs all ask for the number anyway.

Common mistake: forming a PLLC and never applying for the organization NPI. The state approves the entity, the bank opens the account, and claims keep going out under the individual number until a payer notices that the tax ID and the NPI no longer describe the same thing. The application takes minutes. The rework on denied claims does not.

A Type 2 application asks for an EIN and a signature you may not have

Both applications are free and both live in NPPES. The Type 2 version adds three things. It requires an EIN from the IRS, it asks whether the organization is a subpart, and it has to be signed by an Authorized Official rather than by whoever happened to fill out the form.

The Authorized Official is defined narrowly in the NPI Application and Update Form instructions. The signer has to be a general partner, chairman of the board, chief financial officer, chief executive officer, a direct owner of 5 percent or more of the organization, or someone holding a position of similar status and authority. Only that person can sign for the organization. A practice manager who assembles the entire application still can’t certify it.

In our experience, this is where organization applications stall. The form gets built by the person who knows the details, then waits for a signature from someone who is in clinic all week. Line the signer up before you start, not after.

One more line is worth reading before anyone certifies anything. Falsifying an NPI application carries fines of up to $250,000 and up to 5 years imprisonment for an individual, and up to $500,000 for an organization. Sole proprietors also have to apply with their SSN even when they hold an EIN, which feels wrong to every new practice owner and is still the rule.

Your rendering NPI never changes, but your billing NPI does

A single professional claim can carry four NPIs, and only two of them change when you incorporate. The referring provider in item 17b and the rendering provider in item 24J are people, so they stay Type 1. The service facility and the billing provider follow whichever entity owns them.

The Medicare Claims Processing Manual is specific about each field. Item 24J takes the rendering provider NPI in the lower unshaded portion. Item 33a takes the NPI of the billing provider or group and is a required field. Item 32a takes the service facility NPI when Medicare claims processing policy calls for it. Item 17b takes the referring, ordering or supervising provider, and it has to be there whenever a service was ordered or referred.

So the number that identifies your work never moves. The number that collects the money does. That single swap is what makes the difference between the two types matter on payday rather than in theory.

From the licensing desk: the pattern we keep seeing in credentialing packets is a new group with a valid Type 2 that nobody connected to the individual providers. The organization number exists, the clinicians exist, and the payer has no record tying them together. Enumeration creates the numbers. Enrollment is what links them.

If claims started bouncing after a restructure, the problem usually sits in the enrollment record rather than in the NPI. Our team handles credentialing and payer enrollment end to end, including the reassignment paperwork that ties each clinician to the group that bills for them.

Neither number proves you are licensed, credentialed or enrolled

CMS is blunt about the limits. Holding an NPI does not confirm that you are licensed or credentialed, does not enroll you in a health plan, and does not guarantee payment. It’s an identifier and nothing else. Medicare enrollment requires one, and obtaining one enrolls you in nothing.

The practical trap is the update path. Changing your record in NPPES does not update your Medicare enrollment information. Two systems, two edits. Physicians who switch practices and fix only the NPPES record tend to discover the gap at the remittance stage, weeks later.

Licensure is a third track again, run by state boards rather than by CMS. If a new state is on your calendar, our team files physician license applications and keeps the taxonomy and license fields in NPPES consistent with what the board actually issued. To check what any record says today, including your own, use our free provider lookup. For the application itself, we walk through every NPPES screen step by step in a separate guide.

When a payer asks for another NPI, one rule settles it

A health plan may not require a provider who already has an NPI to obtain an additional one. That’s the text of 45 CFR 162.412(b). The exception is narrow and it catches groups: a plan may require a subpart that has no unique NPI to get one as a condition of enrollment.

CMS published guidance on exactly this question in July 2023. A unique NPI means one that is not shared with the parent organization or with another subpart. If the subpart already holds one, the plan cannot demand another. If it does not, the plan can ask for one before it enrolls that location, and Medicaid programs count as health plans here.

The examples in that guidance describe ordinary practices rather than edge cases: a clinic with several locations across a metro area, an outpatient department off the hospital campus, one building licensed to run a pharmacy, a lab and a durable medical equipment supplier. Each of those can be asked to enumerate separately.

Worth knowing: identifying data counts as unique when any single field differs from the parent record, including the taxonomy code or the address. A second location on a different street qualifies. That is why multi site groups finish the year with more Type 2 numbers than they expected to have.

Quick reference

Every number in this guide, in one place. Both applications are free, both are filed in NPPES, and the difference in cost between them is zero. What separates the two types is the tax ID, the signature, and how many numbers each side of the line is allowed to hold.

Frequently asked questions

The Bottom Line

Answer one question and the rest follows: is the entity a person or a business? You will hold exactly one Type 1 for your whole career. You need a Type 2 only when a separate legal entity bills for the care, and once that entity exists it stops being optional.

If a restructure, a new location or a new state is on the calendar, handle the enumeration and the enrollment in the same pass rather than three months apart.

This article provides general guidance only. Enumeration and enrollment requirements change and are applied differently by individual health plans. Always verify current requirements with CMS at nppes.cms.hhs.gov, and confirm the legal structure of your practice with your own attorney or accountant before you apply. Last fact-checked: September 4, 2026.

Written by Medicallicensing Team · Reviewed by David Ivaniuk, CEO Medicallicensing · Last updated: September 4, 2026 · Last fact-checked: September 4, 2026