ALEXANDER CHEN M.D.
NPI 1861556623
Psychiatry & Neurology - Child & Adolescent Psychiatry in San Francisco, CA
NPI Status: Active since December 19, 2006
Contact Information
3801 3RD ST
STE 400
SAN FRANCISCO, CA
ZIP 94124
Phone: (415) 337-4784
- Individual
- Male
- Psychiatry & Neurology
- Child & Adolescent Psychiatry
- PECOS Enrolled
About ALEXANDER CHEN
This page provides the complete NPI Profile along with additional information for Alexander Chen, a provider established in San Francisco, California with a medical specialization in Psychiatry & Neurology, focusing in child & adolescent psychiatry . The healthcare provider is registered in the NPI registry with number 1861556623 assigned on December 2006. The practitioner's primary taxonomy code is 2084P0804X with license number A78692 (CA). The provider is registered as an individual and his NPI record was last updated 18 years ago.
- NPI
- 1861556623
- Provider Name
- ALEXANDER CHEN M.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 3801 3RD ST STE 400 SAN FRANCISCO, CA 94124
- Location Phone
- (415) 337-4784
- Mailing Address
- 3801 3RD ST SUITE 400 SAN FRANCISCO, CA 94124
- Mailing Phone
- (415) 337-4784
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 12-19-2006
- Last Update Date
- 07-08-2007
- Code Navigator
Location Map
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
Psychiatry & Neurology Child & Adolescent Psychiatry
- Taxonomy Code
- 2084P0804X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- A78692
- License State
- CA
- Taxonomy Description
- Child & Adolescent Psychiatry is a subspecialty of psychiatry with additional skills and training in the diagnosis and treatment of developmental, behavioral, emotional, and mental disorders of childhood and adolescence.
Medicare Participation & PECOS Enrollment Status
Alexander Chen is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.
What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.
Is the provider registered in PECOS? Yes
Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes
Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes
Eligible to Order or Refer a Home Health Agency (HHA): Yes
Eligible to Order or Refer Power Mobility Devices: Yes
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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 | 8 | 6 | 1 | 5 | 5 | 6 | 6 | 2 | 3 |
| Step 1: Double the value of the alternate digits, beginning with the rightmost digit. | |||||||||
| 2 | 8 | 12 | 1 | 10 | 5 | 12 | 6 | 4 | |
| Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24. | |||||||||
| 2 + 8 + 1 + 2 + 1 + 1 + 0 + 5 + 1 + 2 + 6 + 4 + 24 = 57 | |||||||||
| Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit. | |||||||||
| 60 - 57 = 3 | 3 | ||||||||
The NPI number 1861556623 is valid because the calculated check digit 3 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 |
|---|---|---|---|
| 1609968098 | MISS RITA MARIA PEREZ LCSW Individual | Social Worker (Clinical) | 3801 3RD ST SUITE 400 SAN FRANCISCO, CA 94124 (415) 970-3821 |
| 1831274380 | DR. MARCIA SPECTOR OMACHI LCSW Individual | Psychologist (Clinical) | 3801 3RD ST SUITE 400 FCMHP SAN FRANCISCO, CA 94124 (415) 970-3884 |
| 1669557237 | DR. PAIGE YVETTE LEOPOLD PH.D. Individual | Psychologist (Clinical Child & Adolescent) | 3801 3RD ST SUITE 400 SAN FRANCISCO, CA 94124 (415) 970-3876 |
| 1689744740 | KATHLEEN K HAMILL PH.D., MFT Individual | Marriage & Family Therapist | 3801 3RD ST SUITE 400 SAN FRANCISCO, CA 94124 (415) 970-3865 |
| 1831261858 | MS. SHANIECE R. WALCOTT Individual | Counselor (Mental Health) | 3801 3RD ST SUITE 400 SAN FRANCISCO, CA 94124 (415) 206-5152 |
| 1023185337 | DR. CAROLINE SALVADOR-MOSES PSY.D. Individual | Psychologist (Clinical) | 3801 3RD ST SUITE 400 SAN FRANCISCO, CA 94124 (415) 970-3853 |
| 1184783912 | DR. DAVE MICKEY CHU PH.D. Individual | Psychologist (Clinical) | 3801 3RD ST SUITE 400 SAN FRANCISCO, CA 94124 (415) 970-3868 |
| 1720147101 | LYORA ZADIK M.S.W Individual | Social Worker (Clinical) | 3801 3RD ST SAN FRANCISCO, CA 94124 (415) 970-3800 |
| 1073675104 | MR. KEVIN JAY SMITH Individual | Counselor (Mental Health) | 3801 3RD ST SUITE 400 SAN FRANCISCO, CA 94124 (415) 970-3800 |
| 1629132444 | JODY SOLLAZZO PSYCHOLOGY, M.A. Individual | Psychologist | 3801 3RD ST SUITE 400 SAN FRANCISCO, CA 94124 (415) 970-3800 |
| 1083778872 | MS. KEIDRA D ARMSTRONG Individual | Counselor (Mental Health) | 3801 3RD ST SAN FRANCISCO, CA 94124 (415) 970-3887 |
| 1023171097 | SAN FRANCISCO DEPARTMENT OF PUBLIC HEALTH Organization | Social Worker (Clinical) | 3801 3RD ST 400 SAN FRANCISCO, CA 94124 (415) 970-3888 |
| 1437213220 | MS. CATI A. OKORIE Individual | Counselor | 3801 3RD ST 400 SAN FRANCISCO, CA 94124 (415) 970-3867 |
| 1073663613 | MR. GUS R ARECHAVALA Individual | Counselor (Mental Health) | 3801 3RD ST BUILDING B, SUITE 400 SAN FRANCISCO, CA 94124 (415) 970-3800 |
| 1548395874 | SHAWN DEMETRIUS TAYLOR Individual | Counselor | 3801 3RD ST 400 SAN FRANCISCO, CA 94124 (415) 672-0799 |
| 1710173125 | MS. NORMA ESTHELA GARCIA Individual | Marriage & Family Therapist | 3801 3RD ST STE 400 SAN FRANCISCO, CA 94124 (415) 970-3850 |
| 1013194406 | MR. ROBERTO ELIGIO ALFARO JR. Individual | Case Manager/Care Coordinator | 3801 3RD ST SAN FRANCISCO, CA 94124 (415) 970-3800 |
| 1003082918 | CITY AND COUNTY OF SAN FRANCISCO Organization | Community/Behavioral Health | 3801 3RD ST BUILDING B, SUITE 400 SAN FRANCISCO, CA 94124 (415) 970-3800 |
| 1124294343 | MISS KATRINA DAUMAS Individual | Counselor (Mental Health) | 3801 3RD ST SAN FRANCISCO, CA 94124 (415) 970-3800 |
| 1700033206 | DAVID LEIVA Individual | Counselor | 3801 3RD ST SUITE 400 SAN FRANCISCO, CA 94124 (415) 970-3800 |
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1861556623, enumerated in the NPI registry as an "individual" on December 19, 2006
The provider is located at 3801 3rd St Ste 400 San Francisco, Ca 94124 and the phone number is (415) 337-4784
The provider's speciality is Psychiatry & Neurology with taxonomy code 2084P0804X with a focus in Child & Adolescent Psychiatry
Yes, as of June 20, 2025 the provider is registered in PECOS and is eligible to order health care services or supplies for Medicare patients. If you are a beneficiary the provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.
This NPI record was last updated on December 19, 2006. 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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