James Gammon, MD
NPI 1598800062 · Ophthalmology Physician · Modesto, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Gammon, MD is a Ophthalmology Physician provider in Modesto, CA (NPI 1598800062).
Provider details
- NPI number
- 1598800062
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- C334380 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
654 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Problem Focused Exam of Visual System92012 | 318 | $89 |
| Photography of the Retina92250 | 107 | $37 |
| Removal of Cataract With Insertion of Prosthetic Lens66984 | 46 | $521 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 40 | $55 |
| New Patient Complete Exam of Visual System92004 | 37 | $149 |
| Imaging of Optic Nerve92133 | 29 | $36 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 768 | 205 |
| Prednisolone Acetate | 277 | 181 |
| Brimonidine Tartrate | 239 | 58 |
| Ofloxacin | 238 | 173 |
| Netarsudil Mesylat/Latanoprostbrand: Rocklatan | 211 | 47 |
| Timolol Maleate | 93 | 26 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 26 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$14 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-02-21
- Last updated
- 2012-10-01
Frequently asked questions
- What is James Gammon's NPI number?
- James Gammon's National Provider Identifier (NPI) is 1598800062, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Gammon's specialty?
- James Gammon is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is James Gammon located?
- James Gammon's practice location on file with NPPES is 500 Coffee Road, Modesto, CA 95355.
- What is James Gammon's phone number?
- The practice phone number listed in the NPPES registry for James Gammon is (209) 522-7362.
- Does James Gammon accept Medicare?
- James Gammon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Gammon's NPI active?
- Yes — James Gammon's NPI (1598800062) is active in the NPPES registry as of the last update on 2012-10-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.