Nathan C. Hamaker, MD
Ophthalmology Physician · Lancaster, CA
Nathan C. Hamaker, MD is an ophthalmology physician with a practice address in Lancaster, California, and NPI 1104852292, issued on Jun 23, 2006. Check the license (California C205778, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Nathan C. Hamaker
- Credential
- MD
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- C205778 CA
Self-reported in NPPES; status is on the state search - Practice location
- 44439 17TH St W # 210, Lancaster, CA 93534
- Phone
- (816) 838-3464
- Enumerated
- Jun 23, 2006
- Record last updated
- Jun 29, 2026
- Fax
- (818) 672-2700
- Medicare enrollment
- Enrolled (PECOS I20070801000603); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical School At Houston, 2003
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Verify Nathan C. Hamaker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C205778Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
78% more Medicare Part D claims than the average ophthalmology physician in 2024
2,701 Medicare Part D claims for 562 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Latanoprost1,331 claims
- Dorzolamide-Timolol306 claims
- Neomycin-Polymyxin-Dexameth228 claims
- Timolol Maleate213 claims
- Travoprost122 claims
- Brimonidine Tartrate102 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $19.99
1 payment: food and beverage; the largest payer was Bausch & Lomb Americas Inc. The 13,221 providers of this specialty with any payment received $4,535.02 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Seibert Mobile Optometry LLCSaint Louis, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathan C. Hamaker among 2,899 ophthalmology physician records in California
Nathan C. Hamaker, MD is one of 2,899 ophthalmology physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 45% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2003 · median 2001 among the 1,907 with a school on file
- Record last updated2026 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in California
There are 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in Lancaster → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Rulon Beesley, M.D.Lancaster, CA 935341902892441
- Lisa Hwang, M.D.Lancaster, CA 935341932376159
- Juliet Kim, MDLancaster, CA 935341679916886
- Avneet Sodhi-Gaur, M.D.Lancaster, CA 935341982929105
- Karen Tison, M.D.Lancaster, CA 935341164476248
- Barbara Yates, MDLancaster, CA 935351164616686
- Daniel Lamothe, M.D.Edwards Afb, CA 935241023071107
- Thomas Reid, M.D.Bishop, CA 935141871530907
Common questions
What is Nathan C. Hamaker, MD's NPI number?
Nathan C. Hamaker, MD's National Provider Identifier (NPI) is 1104852292, issued on Jun 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Nathan C. Hamaker, MD located?
The NPPES record lists a practice address at 44439 17TH St W # 210, Lancaster, CA, 93534. Phone: (816) 838-3464. Providers update this record themselves, so call before visiting.
How can I verify Nathan C. Hamaker, MD's license?
NPPES lists California license number C205778, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nathan C. Hamaker, MD prescribe under Medicare Part D?
In 2024, Nathan C. Hamaker, MD had 2,701 Medicare Part D claims for 562 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.