GROSSMAN AND GROSSMAN MDS A MEDICAL CORPORATION
NPI 1255483525
Obstetrics & Gynecology - Obstetrics in Thousand Oaks, CA
NPI Status: Active since January 17, 2007
Contact Information
558 N VENTU PARK RD
SUITE A
THOUSAND OAKS, CA
ZIP 91320
Phone: (805) 498-0240
- Organization
- Obstetrics & Gynecology
- Obstetrics
- CLIA Number: 05D0862324
- CLIA Cert. Type: Physician Office
- CLIA Exp. Date: 09-13-2027
About GROSSMAN AND GROSSMAN MDS A MEDICAL CORPORATION
This page provides the complete NPI Profile along with additional information for Grossman And Grossman Mds A Medical Corporation, a women's health care provider established in Thousand Oaks, California operating as a Obstetrics & Gynecology, focusing in obstetrics . The healthcare provider is registered in the NPI registry with number 1255483525 assigned on January 2007. The practitioner's primary taxonomy code is 207VX0000X. The provider is registered as an organization and their NPI record was last updated January 2026. Grossman And Grossman Mds A Medical Corporation 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 Robert Grossman M.d. (President)
- NPI
- 1255483525
- Provider Name
- GROSSMAN AND GROSSMAN MDS A MEDICAL CORPORATION
- Entity Type
- Organization
- Location Address
- 558 N VENTU PARK RD SUITE A THOUSAND OAKS, CA 91320
- Location Phone
- (805) 498-0240
- Mailing Address
- 558 N VENTU PARK RD SUITE A THOUSAND OAKS, CA 91320
- Mailing Phone
- (805) 498-0240
- Is Sole Proprietor?
- No
- Is Organization Subpart?
- No
- Enumeration Date
- 01-17-2007
- Last Update Date
- 01-16-2026
- Code Navigator
Women's health care providers like Grossman And Grossman Mds A Medical Corporation treat and diagnose diseases and conditions that affect a woman's physical and emotional health. Women's health professionals come from a variety of different specialties, including obstetrician/gynecologists, general surgeons, perinatologists, physician assistants, nurse practitioners or nurse midwives. A women's health provider might help you with family planning, breast care, pregnancy and child birth, osteoporosis, menopause, heart disease, etc.
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
Obstetrics & Gynecology Obstetrics
- Taxonomy Code
- 207VX0000X
- Type
- Allopathic & Osteopathic Physicians
- Taxonomy Description
- A physician who specializes in diagnosis, treatment, and management of patients with obstetric conditions. Source: National Uniform Claim Committee
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 | 207R00000X | Allopathic & Osteopathic Physicians | Internal Medicine |
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.
CLIA Information
The Clinical Laboratory Improvement Amendments (CLIA) of 1988 applies to facilities or sites that test human specimens for health assessment or to diagnose, prevent, or treat disease. The CLIA Program sets standards for clinical laboratory testing and issues certificates. The NPI / CLIA crosswalk information for this NPI number is:
- CLIA Number
- 05D0862324
- Facility Type
- Physician Office
- Certificate Effective Date
- September 14, 2025
- Certificate Expiration Date
- September 13, 2027
- Laboratory Director
- ROBERT A. GROSSMAN MD
- Certificate Type
- Certificate for Provider-Performed Microscopy Procedures (PPMP)
- Certificate Type Description
- This CLIA certificate is issued to Grossman And Grossman Mds A Medical Corporation in which a physician, midlevel practitioner or dentist that performs specific microscopy procedures during the course of a patient's visit. A limited list of provider-performed microscopy procedures is included under this certificate type, which are categorized as moderate complexity testing.
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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 1255483525, we treat the final digit (5) 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 65. The final step is to find the difference between that total and the next multiple of ten (70 - 65 = 5).
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 65 is 70. The difference is the calculated check digit.
Other Providers at the Same Location
The following 5 providers are registered at the same or a nearby location.
THOUSAND OAKS, CA 91320
NEWBURY PARK, CA 91320
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1255483525, enumerated as an "organization" on January 17, 2007.
The provider is located at 558 N VENTU PARK RD SUITE A THOUSAND OAKS, CA 91320 and the phone number is (805) 498-0240.
Obstetrics & Gynecology with taxonomy code 207VX0000X and a focus in Obstetrics.
