John Gilbert, M.D.
NPI 1588650667 · Endocrinology, Diabetes & Metabolism Physician · Fullerton, CA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Gilbert, M.D. is a Endocrinology, Diabetes & Metabolism Physician provider in Fullerton, CA (NPI 1588650667).
Provider details
- NPI number
- 1588650667
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G53352 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 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
2,054 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 Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 948 | $138 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 696 | $17 |
| Continuous Monitoring of Blood Sugar Level in Tissue Fluid Using Sensor Under Skin With Interpretation and Report95251 | 113 | $36 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 74 | $9 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 61 | $98 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 123 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 1,122 | 302 |
| Metformin Hclbrand: Metformin Hcl Er | 581 | 176 |
| Semaglutidebrand: Ozempic | 562 | 136 |
| Atorvastatin Calcium | 543 | 160 |
| Dapagliflozin Propanediolbrand: Farxiga | 490 | 114 |
| Levothyroxine Sodiumbrand: Synthroid |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$38,683 across 113 records (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
- 2005-09-23
- Last updated
- 2020-10-19
- Certified
- 2020-10-19
Frequently asked questions
- What is John Gilbert's NPI number?
- John Gilbert's National Provider Identifier (NPI) is 1588650667, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Gilbert's specialty?
- John Gilbert is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is John Gilbert located?
- John Gilbert's practice location on file with NPPES is 100 E Valencia Mesa Dr, Fullerton, CA 92835.
- What is John Gilbert's phone number?
- The practice phone number listed in the NPPES registry for John Gilbert is (714) 446-5640.
- Does John Gilbert accept Medicare?
- John Gilbert is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Gilbert's NPI active?
- Yes — John Gilbert's NPI (1588650667) is active in the NPPES registry as of the last update on 2020-10-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.