DR. MARK TONY WILLIAMS M.D.
Complete NPI Record 1780118802
Ophthalmology - Retina Specialist in Orange, CA

Active since April 14, 2017PECOS EnrolledAccepts Medicare Assignment

100/100

CMS Quality Rating

1310 W STEWART DR STE 303, ORANGE, CA 92868(714) 738-4621(714) 409-0629 Get Directions

NPPES record last updated: March 11, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Mar 11, 2025, Nov 6, 2023, Oct 31, 2023 and 2 more (5 updates tracked since 2017).

Complete NPI Dataset

This page contains the complete raw NPPES record for Dr. Mark Tony Williams, M.D. (NPI 1780118802), an individual ophthalmology provider in Orange, CA. All 36 fields on file are listed with their current values and official NPPES definitions, exactly as recorded in the National Plan and Provider Enumeration System. Only fields that contain data are included, so the number of fields shown varies from one NPI record to another.

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NPI: 1780118802: The 10-position all-numeric identification number assigned by the NPS to uniquely identify a health care provider. The NPI number includes an ISO standard check-digit in the 10th position. There is no intelligence about the health care provider in the number.
Entity Type Code: 1: Code describing the type of health care provider that is being assigned an NPI. Codes are 1 = (Person): individual human being who furnishes health care; 2 = (Non-person): entity other than an individual human being that furnishes health care (for example, hospital, SNF, hospital subunit, pharmacy, or HMO).
Provider Last Name Legal Name: WILLIAMS: The last name of the provider. If the provider is an individual, this is the legal name.
Provider First Name: MARK: The first name of the provider, if the provider is an individual.
Provider Middle Name: TONY: The middle name of the provider, if the provider is an individual.
Provider Name Prefix Text: DR.: The name prefix or salutation of the provider if the provider is an individual; for example, Mr., Mrs., or Corporal.
Provider Credential Text: M.D.: The abbreviations for professional degrees or credentials used or held by the provider, if the provider is an individual. Examples are MD, DDS, CSW, CNA, AA, NP, RNA, or PSY. These credential designations will not be verified by NPS.
Provider First Line Business Mailing Address: PO BOX 14107: The first line mailing address of the provider being identified. This data element may contain the same information as "Provider first line location address".
Provider Business Mailing Address City Name: IRVINE: The city name in the mailing address of the provider being identified.
Provider Business Mailing Address State Name: CA: The State or Province name in the mailing address of the provider being identified. This data element may contain the same information as "Provider location address State name".
Provider Business Mailing Address Postal Code: 926234107: The postal ZIP or zone code in the mailing address of the provider being identified. NOTE: ZIP code plus 4-digit extension, if available. This data element may contain the same information as "Provider location address postal code".
Provider Business Mailing Address Country Code If outside U S : US: The country code in the mailing address of the provider being identified. This data element may contain the same information as "Provider location address country code".
Provider Business Mailing Address Telephone Number: 7147384621: The telephone number associated with mailing address of the provider being identified. This data element may contain the same information as "Provider location address telephone number".
Provider Business Mailing Address Fax Number: 7144090629: The fax number associated with the mailing address of the provider being identified. This data element may contain the same information as "Provider location address fax number".
Provider First Line Business Practice Location Address: 1310 W STEWART DR STE 303: The first line location address of the provider being identified. For providers with more than one physical location, this is the primary location. This address cannot include a Post Office box.
Provider Business Practice Location Address City Name: ORANGE: The city name in the location address of the provider being identified.
Provider Business Practice Location Address State Name: CA: The State code in the location of the provider being identified.
Provider Business Practice Location Address Postal Code: 928683838: The postal ZIP or zone code in the location address of the provider being identified. NOTE: ZIP code plus 4-digit extension, if available.
Provider Business Practice Location Address Country Code If outside U S : US: The country code in the location address of the provider being identified.
Provider Business Practice Location Address Telephone Number: 7147384621: The telephone number associated with the location address of the provider being identified.
Provider Business Practice Location Address Fax Number: 7144090629: The fax number associated with the location address of the provider being identified.
Provider Enumeration Date: 4/14/2017: The date the provider was assigned a unique identifier (assigned an NPI).
Last Update Date: 3/11/2025: The date that a record was last updated or changed.
Provider Gender Code: M: The code designating the provider's gender if the provider is a person.
Healthcare Provider Taxonomy Code 1: 207W00000X: This field represents the provider's taxonomy code, which classifies their type, classification, and area of specialization. This code comes from the Healthcare Provider Taxonomy Code Set maintained by the National Uniform Claim Committee (NUCC). The NPS will associate these data with the license data for providers with Entity type code = 1.
Provider License Number 1: A187615: The license number issued to the provider being identified. The NPS can accommodate multiple license numbers for multiple specialties and for multiple States. The NPS will associate this data element with "provider taxonomy code".
Provider License Number State Code 1: CA: The two-letter state code representing the U.S. state or territory that issued the provider's license. This field is linked to the Provider License Number field and identifies the jurisdiction where that license is valid. A provider may have multiple state codes if they hold licenses in more than one state.
Healthcare Provider Primary Taxonomy Switch 1: N: This field shows whether the related taxonomy code is the provider's primary specialty. It is a single-character value: "Y" indicates the taxonomy is the primary one, while "N" indicates it is not. Each provider record can have only one taxonomy code marked as primary.
Healthcare Provider Taxonomy Code 2: 207WX0107X: This field represents the provider's taxonomy code, which classifies their type, classification, and area of specialization. This code comes from the Healthcare Provider Taxonomy Code Set maintained by the National Uniform Claim Committee (NUCC). The NPS will associate these data with the license data for providers with Entity type code = 1.
Provider License Number 2: A187615: The license number issued to the provider being identified. The NPS can accommodate multiple license numbers for multiple specialties and for multiple States. The NPS will associate this data element with "provider taxonomy code".
Provider License Number State Code 2: CA: The two-letter state code representing the U.S. state or territory that issued the provider's license. This field is linked to the Provider License Number field and identifies the jurisdiction where that license is valid. A provider may have multiple state codes if they hold licenses in more than one state.
Healthcare Provider Primary Taxonomy Switch 2: Y: This field shows whether the related taxonomy code is the provider's primary specialty. It is a single-character value: "Y" indicates the taxonomy is the primary one, while "N" indicates it is not. Each provider record can have only one taxonomy code marked as primary.
Is Sole Proprietor: Y: Indicates whether the provider is registered as a sole proprietor. This is a single-character code: "Y" means the provider operates as a sole proprietor, and "N" means they do not.
Healthcare Provider Taxonomy Group 1: 193200000X MULTI-SPECIALTY GROUP: Specifies whether the provider is part of a single-specialty or multi-specialty business group. The possible values are: 193200000X – Multi-Specialty Group or 193400000X – Single Specialty Group. This field helps distinguish the organizational structure of a provider group.
Healthcare Provider Taxonomy Group 2: 193200000X MULTI-SPECIALTY GROUP: Specifies whether the provider is part of a single-specialty or multi-specialty business group. The possible values are: 193200000X – Multi-Specialty Group or 193400000X – Single Specialty Group. This field helps distinguish the organizational structure of a provider group.
NPI Certification Date: 2/14/2025: The date on which the National Provider Identifier (NPI) was officially assigned and certified to the provider. This reflects when the provider's NPI record first became active in the NPPES system.

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