Guillermo Mendoza Fonseca, M.D.
NPI 1285898288 · General Practice Physician · Oviedo, FL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Guillermo Mendoza Fonseca, M.D. is a General Practice Physician provider in Oviedo, FL (NPI 1285898288).
Provider details
- NPI number
- 1285898288
- Entity type
- Individual
- Primary specialty
- General Practice PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- ME117112 (FL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
17 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
1,011 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) |
|---|---|---|
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 | 243 | $61 |
| Management Using the Results of Remote Vital Sign Monitoring Per Calendar Month, First 20 Minutes99457 | 242 | $47 |
| Remote Monitoring of Physiologic Parameters, Initial Supply of Devices With Daily Recordings Or Programmed Alerts Transmission, Each 30 Days99454 | 235 | $44 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 95 | $125 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 65 | $88 |
| Management Using the Results of Remote Vital Sign Monitoring Per Calendar Month, Each Additional 20 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 96 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 275 | 92 |
| Prednisone | 241 | 123 |
| Levothyroxine Sodium | 232 | 68 |
| Amlodipine Besylate | 170 | 57 |
| Losartan Potassium | 166 | 52 |
| Alprazolam | 144 | 18 |
| Azithromycin | 135 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$798 across 33 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
- 2008-07-18
- Last updated
- 2023-03-07
Frequently asked questions
- What is Guillermo Mendoza Fonseca's NPI number?
- Guillermo Mendoza Fonseca's National Provider Identifier (NPI) is 1285898288, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Guillermo Mendoza Fonseca's specialty?
- Guillermo Mendoza Fonseca is listed in the NPPES registry with a primary specialty of General Practice Physician (Allopathic & Osteopathic Physicians).
- Where is Guillermo Mendoza Fonseca located?
- Guillermo Mendoza Fonseca's practice location on file with NPPES is 2572 W State Road 426 Ste 3040, Oviedo, FL 32765-8389.
- What is Guillermo Mendoza Fonseca's phone number?
- The practice phone number listed in the NPPES registry for Guillermo Mendoza Fonseca is (407) 890-9748.
- Does Guillermo Mendoza Fonseca accept Medicare?
- Guillermo Mendoza Fonseca is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Guillermo Mendoza Fonseca's NPI active?
- Yes — Guillermo Mendoza Fonseca's NPI (1285898288) is active in the NPPES registry as of the last update on 2023-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.