SAN FRANCISCO NEPHROLOGY PROFESSIONAL
NPI 1649952268
Internal Medicine - Nephrology in San Francisco, CA
NPI Status: Active since August 03, 2023
Contact Information
636 CLAY ST
SAN FRANCISCO, CA
ZIP 94111
Phone: (833) 370-2086
Fax: (540) 235-5678
- Organization
- Internal Medicine
- Nephrology
About SAN FRANCISCO NEPHROLOGY PROFESSIONAL
This page provides the complete NPI Profile along with additional information for San Francisco Nephrology Professional, an internist established in San Francisco, California operating as a Internal Medicine, focusing in nephrology . The healthcare provider is registered in the NPI registry with number 1649952268 assigned on August 2023. The practitioner's primary taxonomy code is 207RN0300X. The provider is registered as an organization and their NPI record was last updated February 2026. The organization operates as a Single Specialty Group with one or more individual practitioners, all of who practice with the same area of specialization. The authorized official of this NPI record is Celeste S Chang Md (Md)
- NPI
- 1649952268
- Provider Name
- SAN FRANCISCO NEPHROLOGY PROFESSIONAL
- Entity Type
- Organization
- Location Address
- 636 CLAY ST SAN FRANCISCO, CA 94111
- Location Phone
- (833) 370-2086
- Location Fax
- (540) 235-5678
- Mailing Address
- PO BOX 330172 SAN FRANCISCO, CA 94133
- Mailing Phone
- (650) 265-8755
- Mailing Fax
- (540) 235-5678
- Is Sole Proprietor?
- No
- Is Organization Subpart?
- No
- Enumeration Date
- 08-03-2023
- Last Update Date
- 02-22-2026
- Code Navigator
An internist like San Francisco Nephrology Professional is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.
Location Map
Secondary Locations
- 2765 16th St
San Francisco, CA 94103
(833) 389-2155 - 1499 Webster St
San Francisco, CA 94115
(833) 370-2080 - 1493 Webster St
San Francisco, CA 94115
(833) 386-2394
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
Internal Medicine Nephrology
- Taxonomy Code
- 207RN0300X
- Type
- Allopathic & Osteopathic Physicians
- Taxonomy Description
- An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
Group Taxonomy 193400000X MULTIPLE SINGLE SPECIALTY GROUP
This provdier is a business group of one or more individual practitioners, all of who practice with the same area 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 1649952268, we treat the final digit (8) 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 72. The final step is to find the difference between that total and the next multiple of ten (80 - 72 = 8).
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 72 is 80. The difference is the calculated check digit.
Other Providers at the Same Location
The following 1 provider is registered at the same or a nearby location.
SAN FRANCISCO, CA 94111
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1649952268, enumerated as an "organization" on August 03, 2023.
The provider is located at 636 CLAY ST SAN FRANCISCO, CA 94111 and the phone number is (833) 370-2086.
Internal Medicine with taxonomy code 207RN0300X and a focus in Nephrology.
