Quick answers
- Does Carlos A. Fonseca accept Medicare assignment?
- Yes. Medicare's clinician data says Carlos A. Fonseca accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Carlos A. Fonseca see?
- In 2024, CMS data shows 41 Original Medicare patients and 160 services for Carlos A. Fonseca. This counts Original Medicare only and measures volume, not quality.
- What is Carlos A. Fonseca's NPI number?
- 1669480612. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Carlos A. Fonseca, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 41 |
|---|---|
| Services billed to Medicare | 160 |
| Different services or procedures | 19 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)63 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)18 services
- Electronic assessment of bladder emptying (51741)14 services
- Non-needle measurement and recording of electrical activity of muscles at bladder and bowel openings (51784)14 services
- Insertion of device into abdomen with pressure and urine flow rate study (51797)14 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Diabetes59%
- Arthritis46%
- Chronic kidney disease32%
Practice locations
Addresses where Carlos A. Fonseca is enrolled with Medicare (CMS data updated October 2, 2026).
- 1503 Prof Augusto Rodriguez, Cond Asia Suite 401San Juan, PR 00909
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in San Juan
Clinicians with the same Medicare primary specialty in San Juan, PR — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Central Del Caribe Escuela De Medicina |
| Graduation year | 2002 (24 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1669480612 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians