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Carbon Health – San Marcos Clinic
STD/STI testing location in San Marcos, California.
Verify with the clinic before visiting. Hours, services, fees and appointment rules change. Call ahead to confirm. This directory is for information only and is not medical advice. In an emergency, call 911.
Address: 109 South Las Posas Rd, Suite 100, San Marcos, CA 92078
Get directions
Phone: (442) 325-3354
Website: https://carbonhealth.com/locations/san-marcos-ca-grand-plaza
Tests listed
- Chlamydia Test
- Conventional HIV Test
- Gonorrhea Test
- Hepatitis A Test
- Hepatitis B Test
- Hepatitis C Test
- Herpes Test
- Rapid HIV Test
- Syphilis Test
- TB Test
Cost and payment
Fee, Insurance Accepted, Sliding Scale.
Hours
Hours not listed. Call before visiting.
Appointment required: No (walk-ins may be accepted)
Other services
STI treatment, PrEP (HIV prevention medicine).
Languages: English, Interpretation Services Available for Non-English Languages
Type: Clinic
Source: CDC NPIN listing. Last updated by source: 2026-08-11. Page built 2026-11-03.