NPPES
NPI Type 1 vs Type 2 — which does your practice need?
Type 1 is you, the individual, including if you are a sole proprietor. Type 2 is an organization. An incorporated physician often needs both.
The two types
NPI Entity Type 1 is for individual health care providers, including sole proprietors. Entity Type 2 is for organization health care providers.
An individual provider who is incorporated may need both: a Type 1 for themselves, and a Type 2 for the corporation or LLC. Individuals are eligible for exactly one NPI. Organizations can have more than one, through subparts.
Source: CMS NPI Fact Sheet (PDF)
The sole-proprietor rules everyone gets wrong
A sole proprietor applies using their own Social Security Number, not an Employer Identification Number — even if they have an EIN.
A sole proprietor gets one NPI regardless of how many office locations they run, whether they have employees, or whether the IRS issued them an EIN.
And CMS says two things explicitly that cut against the usual assumptions: a sole proprietor is not an incorporated individual, and being a sole or solo practitioner does not necessarily make you a sole proprietor — or the other way round.
What an NPI does not do
CMS states plainly that having an NPI does not ensure a provider is licensed or credentialed, does not guarantee payment by a health plan, and does not enrol a provider in a health plan. A provider will not receive payment from Medicare until properly certified and enrolled.
One trap worth its own sentence: updating your NPI record in NPPES does NOT update your Medicare enrollment record. They are separate systems. This is how revalidation notices end up posted to an address you left years ago.
Covered providers must report changes to their NPI information within 30 days.
Source: CMS NPI Fact Sheet (PDF)
Questions
Do I need a Type 2 NPI if I am a solo doctor?
If you practise as a sole proprietor, no — a Type 1 covers you and CMS says you use your SSN rather than an EIN even if you have one. If you have incorporated, you generally need a Type 1 for yourself and a Type 2 for the corporation or LLC.
Does getting an NPI enrol me in Medicare?
No. CMS states that having an NPI does not enrol a provider in any health plan, does not guarantee payment, and does not mean the provider is licensed or credentialed. Enrollment is a separate application.
I updated my address in NPPES — is that enough?
No. Updates to NPPES do not automatically update your Medicare enrollment information. This is, in our experience, the most common reason a revalidation notice never reaches the practice.
A research summary, not legal or enrollment advice. Every rule above links to the regulation or the CMS document it came from so you can check it rather than trust it.
The rest of the cluster
If this is work somebody on your team is doing at four in the afternoon, it can be a seat.
Next step
A lapsed enrollment stops every claim behind it
A credentialing seat works enrollments, revalidations and CAQH attestation, so none of these dates arrives unannounced.
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