DUNCAN A FRIEDMAN MD PA
NPI 1306348032
Ophthalmology - Retina Specialist in San Antonio, TX
NPI Status: Active since March 08, 2018
Contact Information
622 ISOM RD
SAN ANTONIO, TX
ZIP 78216
Phone: (210) 880-3000
Fax: (210) 227-6056
- Organization
- Ophthalmology
- Retina Specialist
About DUNCAN A FRIEDMAN MD PA
This page provides the complete NPI Profile along with additional information for Duncan A Friedman Md Pa, a provider established in San Antonio, Texas operating as a Ophthalmology, focusing in retina specialist . The healthcare provider is registered in the NPI registry with number 1306348032 assigned on March 2018. The practitioner's primary taxonomy code is 207WX0107X with license number P5275 (TX). The provider is registered as an organization and their NPI record was last updated May 2026. Duncan A Friedman Md Pa operates as a Multi-Specialty Group with one or more individual practitioners, who practice different areas of specialization. The authorized official of this NPI record is Dr. Duncan Aesctun Friedman Md (Administrator)
- NPI
- 1306348032
- Provider Name
- DUNCAN A FRIEDMAN MD PA
- Entity Type
- Organization
- Location Address
- 622 ISOM RD SAN ANTONIO, TX 78216
- Location Phone
- (210) 880-3000
- Location Fax
- (210) 227-6056
- Mailing Address
- 622 ISOM RD SAN ANTONIO, TX 78216
- Mailing Phone
- (210) 880-3000
- Mailing Fax
- (210) 227-6056
- Is Sole Proprietor?
- No
- Is Organization Subpart?
- No
- Enumeration Date
- 03-08-2018
- Last Update Date
- 05-01-2026
- Code Navigator
Location Map
Secondary Locations
- 931 E Main St
Uvalde, TX 78801
(210) 880-3000
Specialty - Primary Taxonomy
The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.
- Classification
Ophthalmology Retina Specialist
- Taxonomy Code
- 207WX0107X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- P5275
- License State
- TX
- Taxonomy Description
- An ophthalmologist who specializes in the diagnosis and treatment of vitreoretinal diseases.
Secondary Taxonomies
The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.
| No. | Taxonomy Code | Type | Classification / Specialization |
License No. (State) |
|---|---|---|---|---|
| 1 | 207W00000X | Allopathic & Osteopathic Physicians | Ophthalmology | P5275 (TX) |
Group Taxonomy 193200000X MULTI-SPECIALTY GROUP
This provider is a business group of one or more individual practitioners, who practice with different areas of specialization.
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NPI NPI Number Validation
How NPI Validation Works
The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.
To verify the NPI 1306348032, we treat the final digit (2) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 58. The final step is to find the difference between that total and the next multiple of ten (60 - 58 = 2).
Digit-by-digit view
Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.
Step 1: Double every other digit from the right
Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 58 is 60. The difference is the calculated check digit.
Other Providers at the Same Location
The following 8 providers are registered at the same or a nearby location.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1306348032, enumerated as an "organization" on March 08, 2018.
The provider is located at 622 ISOM RD SAN ANTONIO, TX 78216 and the phone number is (210) 880-3000.
Ophthalmology with taxonomy code 207WX0107X and a focus in Retina Specialist.
