NPI Taxonomy Codes Explained: What They Mean and How They're Used
September 05, 2026
When looking up a National Provider Identifier (NPI), you may see one or more Health Care Provider Taxonomy Codes associated with the provider. These codes describe the provider's classification or specialization and provide additional information about the type of health care provider associated with an NPI.
A taxonomy code is separate from the NPI itself. The NPI identifies the provider, while taxonomy information helps describe the provider's type, classification or area of specialization.
Understanding this distinction is especially useful when reviewing NPI search results because a single provider may have more than one taxonomy code associated with the same NPI.
What Is an NPI Taxonomy Code?
A Health Care Provider Taxonomy Code is a unique 10-character alphanumeric code used to classify health care providers by provider type, classification and specialization.
The Health Care Provider Taxonomy Code Set is maintained by the National Uniform Claim Committee (NUCC) and is used with the NPI application and in certain electronic health care transactions.
Examples of the types of providers represented within the taxonomy code set include:
- Physicians and physician specialties
- Nurse practitioners and other advanced practice providers
- Behavioral health providers
- Dental providers
- Therapists and rehabilitation providers
- Laboratories
- Hospitals and other health care facilities
- Suppliers
- Groups of health care providers
The taxonomy code set includes classifications for both individual and organizational health care providers.
Is a Taxonomy Code Part of the NPI?
No. The taxonomy code is not encoded within the NPI number.
An NPI is a 10-digit, intelligence-free identifier. The digits do not reveal the provider's specialty, location, license, provider type or other characteristics.
Identifies the health care provider.
Describes the provider's classification or specialization.
For example, two physicians in completely different specialties can each have an NPI without anything in the NPI digits indicating which physician practices which specialty. Their taxonomy information provides that additional classification.
For more information about how NPIs work, see What Is an NPI Number? Complete Guide to National Provider Identifiers.
What Does a Taxonomy Code Look Like?
Taxonomy codes contain 10 alphanumeric characters. The code corresponds to an entry in the Health Care Provider Taxonomy Code Set.
The taxonomy code set is organized into three conceptual levels:
- Provider Grouping – a broad grouping of providers
- Classification – a more specific type of provider
- Area of Specialization – a specialization within a classification when applicable
For example, the following taxonomy codes are included in the 2026 Health Care Provider Taxonomy Code Set:
| Example Provider Classification | Taxonomy Code |
|---|---|
| Chiropractor | 111N00000X |
| Family Medicine | 207Q00000X |
These examples are based on the 2026 taxonomy code set. Taxonomy classifications and codes can be added, modified or retired as the code set is updated over time.
Not every taxonomy entry necessarily represents a medical specialty in the everyday sense of the word. The code set also classifies organizations, facilities, suppliers and other types of health care providers.
Who Maintains Health Care Provider Taxonomy Codes?
The National Uniform Claim Committee (NUCC) maintains the Health Care Provider Taxonomy Code Set.
The code set can change over time as classifications and specializations are added, modified or retired. CMS states that releases of the taxonomy code set occur twice each year, in January and July.
Because the code set can change, taxonomy information should be understood in the context of the version in effect when the information is being reviewed or used.
What Is a Primary Taxonomy Code?
A provider can associate more than one taxonomy code with an NPI. When multiple taxonomy codes are reported in NPPES, one is designated as the primary taxonomy.
The primary taxonomy represents the taxonomy that has been identified as primary within the provider's NPPES record. Other taxonomy codes can also remain associated with the same NPI.
Can a Provider Have More Than One Taxonomy Code?
Yes. NPPES allows a health care provider to report multiple taxonomy codes when more than one classification or specialization applies.
For example, an individual provider may have taxonomy information reflecting more than one area of specialization. An organization may also have multiple classifications or services represented in its NPPES record.
One taxonomy is designated as primary, while additional taxonomy codes can provide further information about the provider.
Can the Same Taxonomy Code Be Used by Many Providers?
Yes. Unlike an NPI, a taxonomy code is not a unique identifier for one particular provider.
Many providers can share the same taxonomy code because the code represents a provider classification or specialization rather than a specific person or organization.
Unique to the enumerated health care provider.
Shared by providers with the same applicable classification or specialization.
Do Type 1 and Type 2 NPIs Have Taxonomy Codes?
Taxonomy information can be associated with both Type 1 individual NPIs and Type 2 organization NPIs.
For an individual, taxonomy may describe a provider classification or specialization. For an organization, taxonomy may describe the type of organization, facility, supplier or other health care entity.
This is another reason taxonomy should not be interpreted only as a physician specialty code.
See NPI Type 1 vs. Type 2: What's the Difference? for more information about individual and organizational NPIs.
Does a Taxonomy Code Prove a Provider Is Licensed or Credentialed?
No. Taxonomy information in an NPI record should not be treated as independent proof that a provider is licensed, certified, credentialed or qualified to provide a particular service.
Providers select taxonomy information when supplying their information to NPPES. CMS has explained that NPPES validates that a selected taxonomy code exists in the current taxonomy code set, but it does not independently verify that the provider has the qualifications represented by the selected taxonomy.
Is a Taxonomy Code the Same as a Provider Specialty?
Not exactly. Some taxonomy codes identify specialties or subspecialties, but the taxonomy code set covers a much broader range of health care provider classifications.
Depending on the provider, taxonomy may describe:
- A provider classification
- A medical specialty or subspecialty
- A type of facility
- A laboratory
- A supplier
- A group of health care providers
- Another type of health care organization or service provider
Therefore, the terms taxonomy code and specialty code should not always be treated as interchangeable.
Are NPI Taxonomy Codes the Same as Medicare Specialty Codes?
No. Health Care Provider Taxonomy Codes and Medicare provider specialty classifications are related concepts but are not necessarily the same coding system.
CMS maintains mappings and crosswalk information between certain taxonomy codes and Medicare provider or supplier types. However, the taxonomy information reported in NPPES may not always correspond directly to the classifications used by Medicare or other health plans for enrollment, credentialing or program purposes.
This distinction is important because a taxonomy code associated with an NPI should not automatically be interpreted as a payer's enrollment or specialty designation for that provider.
Do Health Plans Use Taxonomy Codes?
Taxonomy codes can be used in electronic health care transactions and may also be considered in provider enrollment, identification and claim-processing workflows.
How taxonomy information is used can vary by health plan, program, provider type and transaction. A taxonomy appearing in an NPI record therefore does not by itself establish how a particular payer classifies or processes that provider.
This is similar to the distinction between an NPI and a tax ID: provider information can be related across multiple systems without the identifiers or classifications being interchangeable.
See NPI Number vs. Tax ID (TIN/EIN): What's the Difference? for more information about that distinction.
Can Taxonomy Information Affect Claim Processing?
Taxonomy information can be relevant to claim processing in some situations. A payer or program may use taxonomy along with other provider information when identifying or classifying the provider associated with a transaction.
For that reason, differences among taxonomy information in NPPES, provider enrollment records and information submitted in a transaction can sometimes be relevant when investigating a provider-related claim issue.
The significance of taxonomy information depends on the payer, program, transaction and provider relationship involved. A taxonomy-related issue should therefore not be assumed solely from the presence of a particular code in an NPI record.
Can a Provider's Taxonomy Codes Change?
Yes. Taxonomy information associated with an NPI can change as a provider's classification or specialization changes or as additional taxonomy information becomes applicable.
For example, an individual provider's taxonomy information may change as the provider progresses from training into a licensed profession or adds a specialization. CMS specifically recognizes situations in which taxonomy information in NPPES is updated as a provider's professional status changes.
The taxonomy code set itself can also change over time as NUCC updates the available classifications and specializations.
Does Changing a Taxonomy Code Change the NPI?
Generally, changing taxonomy information does not by itself mean that a provider receives a new NPI.
The NPI identifies the provider, while taxonomy is descriptive information associated with the provider's NPI record. A change in classification or specialization can therefore be reflected in the provider's taxonomy information without changing the underlying NPI solely for that reason.
Where Can You Find a Provider's Taxonomy Code?
Taxonomy information is included in publicly available NPI information and can be viewed when researching an NPI record.
The Eclaims NPI Lookup can be used to search for provider information associated with an NPI, including taxonomy information available in the NPI record.
For help finding and interpreting an NPI record, see How to Look Up an NPI Number.
What Does Taxonomy Information Tell You?
The simplest way to interpret taxonomy information is to view it as descriptive provider classification information associated with the NPI.
It can help answer questions such as:
- Is the NPI associated with an individual or a type of organization?
- What provider classification is represented?
- Is a particular specialization listed?
- Are multiple classifications or specializations associated with the NPI?
- Which taxonomy has been designated as primary?
Taxonomy information adds useful context to an NPI record, but it should be interpreted together with the other provider information available and should not be treated as independent verification of licensing, credentialing or payer participation.
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