CHRISTOPHER CHANG RIOS MD
NPI 1316689334
Internal Medicine in San Francisco, CA
NPI Status: Active since April 11, 2022
Contact Information
521 PARNASSUS AVE
SAN FRANCISCO, CA
ZIP 94143
Phone: (415) 476-1000
- Individual
- Male
- Internal Medicine
About CHRISTOPHER RIOS
This page provides the complete NPI Profile along with additional information for Christopher Rios, an internist established in San Francisco, California with a medical specialization in Internal Medicine. The healthcare provider is registered in the NPI registry with number 1316689334 assigned on April 2022. The practitioner's primary taxonomy code is 207R00000X with license number A190490 (CA). The provider is registered as an individual and his NPI record was last updated July 2025.
- NPI
- 1316689334
- Provider Name
- CHRISTOPHER CHANG RIOS MD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 521 PARNASSUS AVE SAN FRANCISCO, CA 94143
- Location Phone
- (415) 476-1000
- Mailing Address
- 128 RUNNING FARM LN APT 105 STANFORD, CA 94305
- Mailing Phone
- (913) 302-9738
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 04-11-2022
- Last Update Date
- 07-02-2025
- Code Navigator
An internist like Christopher Rios 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
- 505 Parnassus Ave
San Francisco, CA 94143
(415) 476-1000
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
- Taxonomy Code
- 207R00000X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- A190490
- License State
- CA
- Taxonomy Description
- A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
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 | 390200000X | Student, Health Care | Student in an Organized Health Care Education/Training Program |
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NPI Validation Check Digit Calculation
The following table explains the step by step NPI number validation process using the ISO standard Luhn algorithm.
| Start with the original NPI number, the last digit is the check digit and is not used in the calculation. | |||||||||
| 1 | 3 | 1 | 6 | 6 | 8 | 9 | 3 | 3 | 4 |
| Step 1: Double the value of the alternate digits, beginning with the rightmost digit. | |||||||||
| 2 | 3 | 2 | 6 | 12 | 8 | 18 | 3 | 6 | |
| Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24. | |||||||||
| 2 + 3 + 2 + 6 + 1 + 2 + 8 + 1 + 8 + 3 + 6 + 24 = 66 | |||||||||
| Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit. | |||||||||
| 70 - 66 = 4 | 4 | ||||||||
The NPI number 1316689334 is valid because the calculated check digit 4 using the Luhn validation algorithm matches the last digit of the original NPI number.
Other Providers at the Same Location
The following 20 providers are registered at the same or nearby location.
| NPI | Name / Type | Taxonomy | Address |
|---|---|---|---|
| 1558357350 | DR. MICHAEL E WINTER PHARM.D. Individual | Pharmacist | 521 PARNASSUS AVE C 152 SAN FRANCISCO, CA 94143 (415) 476-8891 |
| 1548258411 | DR. LISA M. TONG PHARM.D. Individual | Pharmacist | 521 PARNASSUS AVE C152 SAN FRANCISCO, CA 94143 (415) 353-1096 |
| 1710976931 | DR. DWIGHT UTZMAN PHARM.D. Individual | Pharmacist | 521 PARNASSUS AVE C-152 BOX 0622 SAN FRANCISCO, CA 94143 (415) 353-8851 |
| 1326020942 | DR. PATRICK THOMAS WONG PHARM.D. Individual | Pharmacist | 521 PARNASSUS AVE BOX 0622 SAN FRANCISCO, CA 94143 (415) 353-8828 |
| 1295790913 | JEFFREY A. KATZ MD Individual | Anesthesiology | 521 PARNASSUS AVE SAN FRANCISCO, CA 94143 (415) 476-3916 |
| 1679539530 | DR. MICHAEL A. POGREL MD, DDS Individual | Oral & Maxillofacial Surgery | 521 PARNASSUS AVE SAN FRANCISCO, CA 94143 (415) 476-3242 |
| 1265499842 | KARIN VARGERVIK DDS Individual | Dentist (Oral and Maxillofacial Surgery) | 521 PARNASSUS AVE SAN FRANCISCO, CA 94143 (415) 476-2271 |
| 1356391130 | DR. JOANNE N. ENGEL MD Individual | Internal Medicine | 521 PARNASSUS AVE SAN FRANCISCO, CA 94143 (415) 476-7355 |
| 1386682417 | DR. JOHN C. MCQUITTY M.D. Individual | Pediatrics | 521 PARNASSUS AVE SAN FRANCISCO, CA 94143 (415) 476-2072 |
| 1316981533 | DR. RICHARD M. LOCKSLEY M.D. Individual | Internal Medicine | 521 PARNASSUS AVE SAN FRANCISCO, CA 94143 (415) 476-9362 |
| 1821025479 | DR. JON D. LEVINE M.D. Individual | Internal Medicine | 521 PARNASSUS AVE SAN FRANCISCO, CA 94143 (415) 353-2497 |
| 1801902002 | DR. AARON MARTIN HUWE PHARM.D. Individual | Pharmacist | 521 PARNASSUS AVE C 152, BOX 0622 SAN FRANCISCO, CA 94143 (415) 353-1028 |
| 1790883924 | DAVID JEFFREY QUAN PHARM.D. Individual | Pharmacist (Pharmacotherapy) | 521 PARNASSUS AVE ROOM C-152, BOX 0622 SAN FRANCISCO, CA 94143 (415) 353-1462 |
| 1508965385 | DR. TERRIE TIEN NGHIEM PHARM.D. Individual | Pharmacist | 521 PARNASSUS AVE ROOM C-152, BOX 0622 SAN FRANCISCO, CA 94143 (415) 353-1335 |
| 1053411611 | MS. ISING (VICKI) JUE PHARM.D. Individual | Pharmacist | 521 PARNASSUS AVE ROOM C-152, BOX 0622 SAN FRANCISCO, CA 94143 (415) 353-8827 |
| 1356432843 | LARISSA RETTA GRAFF PHARM.D. Individual | Pharmacist | 521 PARNASSUS AVE BOX 0622, ROOM C-152 SAN FRANCISCO, CA 94143 (415) 353-1850 |
| 1093807331 | DR. HELEN T WU PHARM.D. Individual | Pharmacist (Pharmacotherapy) | 521 PARNASSUS AVE ROOM C-152, BOX 0622 SAN FRANCISCO, CA 94143 (415) 353-1315 |
| 1780773374 | DR. CONAN MACDOUGALL PHARM.D. Individual | Pharmacist (Pharmacotherapy) | 521 PARNASSUS AVE C-152, BOX 0622 SAN FRANCISCO, CA 94143 (415) 502-9573 |
| 1811087976 | CANDY TSOUROUNIS PHARM.D. Individual | Pharmacist (Pharmacotherapy) | 521 PARNASSUS AVE ROOM C-152, BOX 0622 SAN FRANCISCO, CA 94143 (415) 502-5091 |
| 1437248234 | MS. JENNIFER COCOHOBA PHARM.D. Individual | Pharmacist | 521 PARNASSUS AVE C-152, BOX 0622 SAN FRANCISCO, CA 94143 (415) 514-0892 |
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1316689334, enumerated in the NPI registry as an "individual" on April 11, 2022
The provider is located at 521 Parnassus Ave San Francisco, Ca 94143 and the phone number is (415) 476-1000
The provider's speciality is Internal Medicine with taxonomy code 207R00000X
This NPI record was last updated on April 11, 2022. To officially update your NPI information contact the National Plan and Provider Enumeration System (NPPES) at 1-800-465-3203 (NPI Toll-Free) or by email at [email protected].
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