MARK E CLAYCOMB LCSW
NPI 1790791796
Psychologist in San Francisco, CA
NPI Status: Active since July 31, 2006
Contact Information
55 NEW MONTGOMERY ST
#420
SAN FRANCISCO, CA
ZIP 94105
Phone: (415) 522-7400
Fax: (445) 543-1932
Some details in this NPI profile have been updated in the NPI registry within the last 30 days.
- Individual
- Male
- Psychologist
About MARK CLAYCOMB
This page provides the complete NPI Profile along with additional information for Mark Claycomb, a provider established in San Francisco, California with a medical specialization in Psychologist. The healthcare provider is registered in the NPI registry with number 1790791796 assigned on July 2006. The practitioner's primary taxonomy code is 103T00000X with license number LCS135532 (CA). The provider is registered as an individual and his NPI record was last updated September 2025.
- NPI
- 1790791796
- Provider Name
- MARK E CLAYCOMB LCSW
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 55 NEW MONTGOMERY ST #420 SAN FRANCISCO, CA 94105
- Location Phone
- (415) 522-7400
- Location Fax
- (445) 543-1932
- Mailing Address
- 55 NEW MONTGOMERY ST #420 SAN FRANCISCO, CA 94105
- Mailing Phone
- (415) 522-7400
- Mailing Fax
- (445) 543-1932
- Is Sole Proprietor?
- No
- Enumeration Date
- 07-31-2006
- Last Update Date
- 09-11-2025
- Code Navigator
A psychologist like Mark Claycomb studies cognitive, emotional, social processes and behavior by observing, interpreting, and recording how people relate to one another and to their environments. Psychologists gather information and evaluate behavior through controlled laboratory experiments, psychoanalysis, psychotherapy or through personality, performance, aptitude, or intelligence tests, and use this information when testing theories in their research or when treating patients.
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
Psychologist
- Taxonomy Code
- 103T00000X
- Type
- Behavioral Health & Social Service Providers
- License No.
- LCS135532
- License State
- CA
- Taxonomy Description
- A psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles, methods, and procedures, for the purpose of preventing or eliminating symptomatic, maladaptive, or undesired behavior and of enhancing interpersonal relationships, work and life adjustment, personal effectiveness, behavioral health, and mental health. The practice of psychology includes, but is not limited to, psychological testing and the evaluation or assessment of personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning; counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy; diagnosis and treatment of mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability; and psycheducational evaluation, therapy, remediation, and consultation. Psychological services may be rendered to individuals, families, groups and the public.
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 | 104100000X | Behavioral Health & Social Service Providers | Social Worker | LCS13553 (CA) |
Reviews for MARK E CLAYCOMB LCSW
There are currently no reviews for this provider. Be the first person to share your experience with this provider by filling out our review form. Your insights are appreciated and will help others make informed decisions.
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 | 7 | 9 | 0 | 7 | 9 | 1 | 7 | 9 | 6 |
| Step 1: Double the value of the alternate digits, beginning with the rightmost digit. | |||||||||
| 2 | 7 | 18 | 0 | 14 | 9 | 2 | 7 | 18 | |
| Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24. | |||||||||
| 2 + 7 + 1 + 8 + 0 + 1 + 4 + 9 + 2 + 7 + 1 + 8 + 24 = 74 | |||||||||
| Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit. | |||||||||
| 80 - 74 = 6 | 6 | ||||||||
The NPI number 1790791796 is valid because the calculated check digit 6 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 |
|---|---|---|---|
| 1285665372 | MR. PETER PAUL LEWANDOWSKI D.C. Individual | Chiropractor | 55 NEW MONTGOMERY ST MEZZANINE LEVEL SAN FRANCISCO, CA 94105 (415) 896-2273 |
| 1609951821 | DR. JAY ANDREW TALKOFF PH.D. Individual | Psychologist | 55 NEW MONTGOMERY ST SUITE 420 SAN FRANCISCO, CA 94105 (415) 386-4665 |
| 1225106628 | DR. MILAM KEN FREITAG PH.D. Individual | Psychologist | 55 NEW MONTGOMERY ST SUITE 420 SAN FRANCISCO, CA 94105 (415) 522-2953 |
| 1154457638 | DR. PEARL BONNIE WERFEL PHD Individual | Psychologist (Clinical) | 55 NEW MONTGOMERY ST SUITE 420 SAN FRANCISCO, CA 94105 (510) 665-5802 |
| 1073636783 | DR. KATHERINE DOROTHY CZESAK PH.D. Individual | Psychologist (Clinical) | 55 NEW MONTGOMERY ST SUITE 424 SAN FRANCISCO, CA 94105 (415) 495-5566 |
| 1689897068 | DR. DWIGHT H. GRISHAM M.A.,ED.S., ED.D. Individual | Psychologist (Cognitive & Behavioral) | 55 NEW MONTGOMERY ST SUITE 725 SAN FRANCISCO, CA 94105 (415) 543-2418 |
| 1881811016 | MRS. KARLA H TALKOFF MA Individual | Marriage & Family Therapist | 55 NEW MONTGOMERY ST SUITE 420 SAN FRANCISCO, CA 94105 (415) 905-5811 |
| 1528279759 | MS. KIMBERLY ANNE PRATT MSW, LICSW, LCSW Individual | Social Worker (Clinical) | 55 NEW MONTGOMERY ST SUITE 507 SAN FRANCISCO, CA 94105 (415) 595-0771 |
| 1033399712 | DR. FRANCES W STOTT PHD Individual | Psychologist | 55 NEW MONTGOMERY ST STE #420 SAN FRANCISCO, CA 94105 (415) 337-0304 |
| 1285958157 | VANESSA BETH TATE LMFT Individual | Marriage & Family Therapist | 55 NEW MONTGOMERY ST SUITE 804 SAN FRANCISCO, CA 94105 (415) 820-1661 |
| 1487987129 | BETTY MICHAUD M.F.T. Individual | Marriage & Family Therapist | 55 NEW MONTGOMERY ST SUITE 316 SAN FRANCISCO, CA 94105 (415) 997-8761 |
| 1205115185 | DR. ADAM BLUM PSY.D. Individual | Psychologist (Clinical) | 55 NEW MONTGOMERY ST SUITE 506 SAN FRANCISCO, CA 94105 (510) 604-4975 |
| 1982834115 | LEIGH LYNDON Individual | Psychologist (Clinical) | 55 NEW MONTGOMERY ST #506 SAN FRANCISCO, CA 94105 (510) 842-7245 |
| 1083947469 | DR. JONATHAN DAVID HOROWITZ PH.D. Individual | Psychologist (Clinical) | 55 NEW MONTGOMERY ST SUITE 512 SAN FRANCISCO, CA 94105 (415) 799-3688 |
| 1043608227 | SAN FRANCISCO STRESS AND ANXIETY CENTER Organization | Psychologist | 55 NEW MONTGOMERY ST SUITE 512 SAN FRANCISCO, CA 94105 (415) 799-3688 |
| 1407274640 | ELLEN L. MARINO LMFT Individual | Marriage & Family Therapist | 55 NEW MONTGOMERY ST SUITE 303 SAN FRANCISCO, CA 94105 (415) 564-3936 |
| 1598851792 | DR. CHRISTOPHER H XAVIER D.C. Individual | Chiropractor | 55 NEW MONTGOMERY ST #501 SAN FRANCISCO, CA 94105 (415) 546-9642 |
| 1952839334 | DR. KATRINA ROUNDFIELD PHD Individual | Psychologist (Clinical) | 55 NEW MONTGOMERY ST SAN FRANCISCO, CA 94105 (510) 552-6102 |
| 1134420409 | DR. CATHERINE CHRISTY CORCORAN PSY.D. Individual | Psychologist (Clinical) | 55 NEW MONTGOMERY ST STE 420 SAN FRANCISCO, CA 94105 (415) 419-3558 |
| 1174680250 | DR. DIANE PICKETT PH.D. Individual | Psychologist | 55 NEW MONTGOMERY ST STE 424 SAN FRANCISCO, CA 94105 (415) 945-0211 |
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1790791796, enumerated in the NPI registry as an "individual" on July 31, 2006
The provider is located at 55 New Montgomery St #420 San Francisco, Ca 94105 and the phone number is (415) 522-7400
The provider's speciality is Psychologist with taxonomy code 103T00000X
This NPI record was last updated on July 31, 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].
NPI Profile data is regularly updated with the latest NPI registry information, if you would like to update or remove your NPI Profile in this website please contact us.