Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Andrea Heyn, MD

Individual provider Obstetrics & Gynecology Physician · NPI 1194159319

Andrea Heyn, MD is registered under Family Practice in Greenville, South Carolina. Graduated from Loma Linda University School of Medicine in 2013, 13 years ago. Practices with Timothy S Johnston MD PC, a 9-clinician group, works from 8 locations and accepts Medicare assignment. Licensed in California and South Carolina.

Years since qualifying
13
Trained at
Loma Linda University School of Medicine
Licensed in
CA, SC
In the registry since
2013
Specialties on file
4
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

877 W Faris Rd Ste A
Greenville, SC 29605-4296
Phone: (864) 455-7800
Fax: (864) 455-9082
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (7)

  • 2823 Fresno St, Fresno, CA 93721-1324 — (559) 459-6000
  • 3940 Sandpiper Ave, Merced, CA 95340-8372 — (209) 722-4842
  • 3349 G St Ste F, Merced, CA 95340-0978 — (209) 349-8459
  • 127 W El Portal Dr, Merced, CA 95348-2853 — (209) 723-3704
  • 857 W Childs Ave, Merced, CA 95341-6862 — (209) 722-4842
  • 374 W Olive Ave Ste B, Merced, CA 95348-3181 — (209) 383-3076
  • 372 W Cypress Ave, Reedley, CA 93654-2113 — (559) 638-8155

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 96785 (SC)
Obstetrics & Gynecology Physician Taxonomy 207V00000X · Licence A132106 (CA)
Obstetrics Physician Taxonomy 207VX0000X · Licence A132106 (CA)
Family Medicine Physician Taxonomy 207Q00000X · Licence A132106 (CA)

Record details

NPI number1194159319
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 23, 2013
Last updated in NPPESJune 15, 2026
Certification dateJune 15, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Medical schoolLOMA LINDA UNIVERSITY SCHOOL OF MEDICINE
Graduated 2013 (13 years in practice)
Group practice Timothy S Johnston Md Pc — 9 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Removal of skin lesions 1–10 times
Skin biopsy 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients62
Services billed 169 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $109 4 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Mercy Medical Center Hospital · Merced, CA

Colleagues at Timothy S Johnston MD PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Greenville