Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Nathan C Hamaker, MD

Individual provider Ophthalmology Physician · NPI 1104852292

Dr. Nathan C Hamaker, MD practises Ophthalmology in Lancaster, California. Graduated from University of Texas Medical School at Houston in 2003, 23 years ago. Practices with Seibert Mobile Optometry LLC, a 10-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
23
Trained at
University of Texas Medical School at Houston
Licensed in
CA
In the registry since
2006
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

44439 17th St W # 210
Lancaster, CA 93534-2831
Phone: (816) 838-3464
Fax: (818) 672-2700
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Ophthalmology Physician (primary) Taxonomy 207W00000X · Licence C205778 (CA)

Record details

NPI number1104852292
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 23, 2006
Last updated in NPPESJune 29, 2026
Certification dateJune 29, 2026

Medicare enrollment

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

Medicare specialtyOPHTHALMOLOGY
Medical schoolUNIVERSITY OF TEXAS MEDICAL SCHOOL AT HOUSTON
Graduated 2003 (23 years in practice)
Group practice Seibert Mobile Optometry Llc — 10 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients794
Services billed 1,709 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

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.

Colleagues at Seibert Mobile Optometry LLC

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

Other providers in Lancaster