MEDMARK TREATMENT CENTERS - FAIRFIELD, INC.
NPI 1669534491
Clinic/Center - Methadone in Fairfield, CA
NPI Status: Active since December 15, 2006
Contact Information
1143 MISSOURI STREET
FAIRFIELD, CA
ZIP 94533
Phone: (707) 435-9911
Fax: (707) 435-0704
- Organization
- Clinic/Center
- Methadone
- CLIA Number: 05D2029341
- CLIA Cert. Type: Other - NARCOTIC TREATMENT CTR
- CLIA Exp. Date: 09-05-2027
About MEDMARK TREATMENT CENTERS - FAIRFIELD, INC.
This page provides the complete NPI Profile along with additional information for Medmark Treatment Centers - Fairfield, Inc., a provider established in Fairfield, California operating as a Clinic/center, focusing in methadone . The healthcare provider is registered in the NPI registry with number 1669534491 assigned on December 2006. The practitioner's primary taxonomy code is 261QM2800X with license number 48-03 (CA). The provider is registered as an organization and their NPI record was last updated March 2026. The provider's
- NPI
- 1669534491
- Provider Legal Name
- MEDMARK TREATMENT CENTERS - FAIRFIELD, INC.
- Other Organization Name
- Other Name Type
- (6)
- Entity Type
- Organization
- Location Address
- 1143 MISSOURI STREET FAIRFIELD, CA 94533
- Location Phone
- (707) 435-9911
- Location Fax
- (707) 435-0704
- Mailing Address
- 1720 LAKEPOINTE DR STE 117 LEWISVILLE, TX 75057
- Mailing Phone
- (214) 379-3300
- Mailing Fax
- (707) 435-0704
- Is Sole Proprietor?
- No
- Is Organization Subpart?
- No
- Enumeration Date
- 12-15-2006
- Last Update Date
- 03-18-2026
- 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
Clinic/Center Methadone
- Taxonomy Code
- 261QM2800X
- Type
- Ambulatory Health Care Facilities
- License No.
- 48-03
- License State
- CA
- Taxonomy Description
- An entity, facility, or distinct part of a facility providing diagnostic, and replacement maintenance treatment services related to individuals with drug addiction.
Insurance Plans Accepted
According to publicly available information the provider might be accepting the following health plans from these health insurance companies:
Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.
Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.
Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.
*Please verify directly with this provider to make sure your insurance plan is currently accepted.
Additional Identifiers
The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.
| Identifier | Type / Code | Identifier State | Identifier Issuer |
|---|---|---|---|
| 48AA | MEDICAID (05) | CA | |
| 48AA | OTHER (01) | CA | MEDI-CAL |
Areas of Expertise
The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.
Medication assisted treatment, methadone; weekly bundle including dispensing and/or administration, substance use counseling, individual and group therapy, and toxicology testing, if performed (provision of the services by a medicare-enrolled opioid treatm
Medication assisted treatment, weekly bundle not including the drug, including substance use counseling, individual and group therapy, and toxicology testing if performed (provision of the services by a medicare-enrolled opioid treatment program)
Take-home supply of methadone; up to 7 additional day supply (provision of the services by a medicare-enrolled opioid treatment program); list separately in addition to code for primary procedure
Medication Assisted Treatment (MAT) with methadone is a comprehensive approach to manage opioid addiction. It includes weekly methadone dispensing, substance use counseling, individual and group therapy sessions, and toxicology tests as needed, all provided by a Medicare-enrolled opioid treatment program.
This service was performed 1,450 times for 49 patientsMedication Assisted Treatment is a comprehensive program for managing substance use. It includes counseling (both individual and group), along with regular toxicology testing if required. This service is provided by a Medicare-enrolled opioid treatment program.
This service was performed 200 times for 26 patientsThis service provides an additional 7-day supply of methadone, a medication used to treat opioid addiction, for patients to take at home. It's provided by a Medicare-enrolled opioid treatment program. This service is billed separately from the main treatment procedure.
This service was performed 535 times for 33 patientsCLIA 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
- 05D2029341
- Facility Type
- Other - NARCOTIC TREATMENT CTR
- Certificate Effective Date
- September 06, 2025
- Certificate Expiration Date
- September 05, 2027
- Laboratory Director
- DR. GILBERT GREENE
- Certificate Type
- Certificate of Waiver
- Certificate Type Description
- This CLIA certificate is issued to Medmark Treatment Centers - Fairfield, Inc. to perform only waived tests. CLIA defines waived tests as simple tests with a low risk for an incorrect result. Waived tests include certain tests listed in CLIA regulations, tests cleared by the FDA for home use and tests approved by the FDA for waived status and that meet CLIA waiver criteria.
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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 1669534491, we treat the final digit (1) 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 69. The final step is to find the difference between that total and the next multiple of ten (70 - 69 = 1).
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 69 is 70. The difference is the calculated check digit.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1669534491, enumerated as an "organization" on December 15, 2006.
The provider is located at 1143 MISSOURI STREET FAIRFIELD, CA 94533 and the phone number is (707) 435-9911.
Clinic/Center with taxonomy code 261QM2800X and a focus in Methadone.
The provider might be accepting Accepts: Medicare, Medicaid and California Medicaid. Please consult your insurance carrier or call the provider to verify.
