Dr. John Hollister Thacher, MD

Individual provider Dermatopathology Physician · NPI 1205962032

Dr. John Hollister Thacher, MD practises Dermatology in Ojai, California. Graduated from University of Southern California Keck School of Medicine in 1969, 57 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in California.

Years since qualifying: 57
Trained at: University of Southern California Keck School of Medicine
Licensed in: CA
In the registry since: 2007

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

115 Pirie Rd Ste F
Ojai, CA 93023-3100
Phone: (805) 648-6969
Fax: (805) 648-3762

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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Dermatopathology Physician (primary)	Taxonomy 207ND0900X · Licence G18881 (CA)

Record details

NPI number	1205962032
Entity type	Individual (Type 1)
Gender	Male
Credentials	MD
Sole proprietor	Yes
NPI enumerated	February 26, 2007
Last updated in NPPES	March 6, 2025
Certification date	March 6, 2025

Medicare enrollment

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

Medicare specialty	DERMATOLOGY
Medical school	UNIVERSITY OF SOUTHERN CALIFORNIA KECK SCHOOL OF MEDICINE
Graduated	1969 (57 years in practice)
Accepts Medicare assignment	Yes — accepts the Medicare-approved amount

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.

Melanoma (skin cancer) excision	68 times · 90th percentile
Removal of skin lesions	626 times · 89th percentile
Skin biopsy	104 times · 76th percentile
Removal or shaving of skin growth	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 patients	669
Services billed	3,574 a service is one billed item, such as a visit, a test or a procedure
Average patient age	80

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.