NPI - Providers


NPI Readiness
Availity is making every effort to confirm and communicate the status of our connected payers. For our most up-to-date list, please review the NPI Readiness of these payers.



NPI Education


How to Get Your NPI

Visit the National Plan and Provider Enumeration System (NPPES) or call 1-800-465-3203 for a paper application.

NPI Readiness

Effective May 17, 2008, Availity is requiring that all connected payers process any X12 HIPAA standard electronic transactions according to one of the following options.

The options of NPI readiness are as follows:
  1. Legacy ID Required
    • NPI allowed
    • Legacy identifier required
  2. Dual ID
    Allows all of the following scenarios:
    1. NPI only
    2. Legacy identifier only
    3. NPI and Legacy identifiers


  3. NPI per Mandate
    • NPI required per mandate under HIPAA regulations
    • Legacy identifier not allowed
  4. NPI per Mandate. Legacy ID also allowed.
    • NPI required per mandate under HIPAA regulations
    • Legacy identifier also allowed
    • Available for EDI and B2B only
As noted above, all payers either accept or mandate use of the NPI.

  • If you send a transaction without an NPI to a payer who is following Option 3 or 4, the transaction will be rejected.
  • If you send a transaction with a Legacy ID to a payer who is following Option 3, the transaction will be rejected.
  • Tax ID is not considered a Legacy ID when used to identify the provider as a taxpayer for reporting to the IRS. Please be aware when this ID is required.
Rejection of claims can affect timely payment of your claims. Please communicate with health plans you bill and pay attention to information you receive from health plans. You must be aware of each specific health plan’s NPI requirements and enforcement date.

Availity is making every effort to confirm and communicate the status of our connected payers. For our most up-to-date list, please review the NPI Readiness of these payers.

Availity’s NPI Validation Rules

In order to support each payer’s readiness for NPI, Availity must validate transactions according to Option specific rules. Options 3 and 4 are new and currently active. Please select one of the new options for validation details.

  • Option 3 (pdf) – NPI per Mandate
  • Option 4 (pdf) – NPI per Mandate. Legacy ID also allowed.
All web transactions are formatted according to the payer’s NPI readiness. If an NPI is required by the payer, the NPI field will be required on the screen.

Availity will not manipulate EDI/B2B transactions in order to make them compliant for the payer’s requirements. Availity will validate all incoming EDI transactions according to the payer’s NPI readiness. Availity will reject transactions if identification numbers do not follow the payer’s requirements.

  • If a payer requires an NPI, Availity will not add a provider’s NPI and submit to the payer.
  • If a payer does not allow Legacy IDs, Availity will not strip the Legacy ID and submit to the payer.
Availity has built its reputation on transaction compliance and will not be removing legacy identifiers from transactions. By not removing legacy identifiers, this tradition continues, ensuring that our customers' data is secure, accurate, and in the format required by our payers.

NPI Specific EDI Error Messages

Error When is this active? Error Message What does this mean?
Invalid NPI Format (NM1 Segment) Now active and will continue to be active for ALL NPI Readiness Options – 1,2,3 and 4. The National Provider ID (NPI) submitted is not in the valid NPI format. Please correct and resubmit. Providers can apply for an NPI online at https://nppes.cms.hhs.gov. The NPI submitted was not in the proper format. It must be a 10-digit number (9 numeric digits followed by one numeric check digit). This will occur any time you send the ‘XX’ qualifier in NM108 and send an improperly formatted NPI in NM109.
NPI is Missing (NM1 Segment) Effective May 18, 2008 for all payers in NPI Readiness Option 3 or 4. The National Provider ID (NPI) is required for this payer. Expected value for NM108 is 'XX.' Please add the Provider’s NPI to this claim and resubmit the claim(s) for processing. Providers can apply for an NPI online at https://nppes.cms.hhs.gov. The valid qualifier sent for an NPI in NM108 is ‘XX.’ You will receive this message if you send any qualifier other than ‘XX’ when NPI is mandated for use.
Legacy ID Not Allowed (REF Segment) Effective May 18, 2008 for all payers in NPI Readiness Option 3. The legacy identifier, <Decode of the REF01>, may not be used for this payer after the National Provider ID (NPI) is mandated for use. Please correct and resubmit. The payer’s legacy identifier is not allowed for payers following NPI Mandate guidelines. Note – State license numbers (0B) will continue to be accepted.
Tax ID/SSN is Missing (REF Segment) Now active and will continue to be active for ALL NPI Readiness Options – 1,2,3 and 4. Segment REF (Billing/Pay-To Provider Secondary Identification) is missing. Either EIN or SSN of Provider must be carried in this REF segment when NM108 is 'XX'. For Professional and Facility Claims only – If the NPI is sent in the NM1 loop for the Billing (2010AA)/Pay-to Provider (2010AB), then either the Employer’s Identification Number (IEN) or the Social Security Number (SSN) must be sent in the REF segment of the same loop.


Register Your NPI with Health Plans

Providers must ensure they have correctly registered their NPI with any applicable health plans prior to including them on any health care transactions. Availity is not responsible for registering individual NPI numbers or verifying the accuracy of the NPI registered for a given provider. Additionally, it is also imperative to include the XX qualifier in any transactions which require the NPI.

Atypical Providers

Availity will continue to accept the existing legacy identifier as the primary identifier for atypical providers. Atypical providers are non-health care providers who are not eligible to obtain an NPI, such as taxi and construction companies. Such providers will need to register their identifiers with Availity. Availity will maintain a database of registered identifiers and refer to it to determine if an NPI is required for the submitting provider.
  • WEB - Atypical providers submitting via the web must complete the ID tab within the Maintain Provider function by selecting the option indicating that they are not required to have an NPI and completing the ID field for their primary identifier. This functionality is currently available.
  • Non-WEB (EDI/B2B) - Transactions submitted by or on behalf of atypical providers without an NPI will be rejected unless they are registered as an atypical provider with Availity. You may contact Client Services for assistance in registering atypical providers. If you wish to contact Availity on behalf of your atypical providers, we request that you send a list of atypical providers and their primary identifiers to npiquestions@availity.com ahead of time. This will ensure a smooth transition for the atypical providers, and avoid rejections and possible claim delays.
This registration allows Availity to relax the NPI requirement in order to properly pass the transaction to the payer. Availity has no way of knowing every impacted payer, and therefore cannot notify payers of a provider’s atypical status. Atypical providers should notify applicable payers of their status so that transactions are not rejected by the payer for a missing NPI.

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