Quick answers
- Where does Luis Martinez-Sierra see patients?
- Medicare's clinician data lists 2 practice locations, including Ponce, PR. Call before your visit to confirm the address.
- What is Luis Martinez-Sierra's specialty?
- Medicare lists Gastroenterology as the primary specialty.
- Does Luis Martinez-Sierra accept Medicare assignment?
- Yes. Medicare's clinician data says Luis Martinez-Sierra accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Luis Martinez-Sierra?
- (787) 840-0100, as listed in official Medicare / NPI Registry data.
- What is Luis Martinez-Sierra's NPI number?
- 1376673335. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Luis Martinez-Sierra is enrolled with Medicare (CMS data updated 2026-10-02).
- 450 Calle Ferrocarril, Suite 210Ponce, PR 00717 (787) 840‑0100
- 450 Calle Ferrocarril, Suite 216Ponce, PR 00717 (787) 848‑5897
Group practices
Medicare enrollment lists Luis Martinez-Sierra as a member of these groups (CMS data updated 2026-10-02).
- Ponce Gastroenterology Society3 clinicians in the group
- Instituto de Endoscopia Digestiva del Sur2 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Ponce
Clinicians with the same Medicare primary specialty in Ponce, PR — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Puerto Rico School Of Medicine |
| Graduation year | 1973 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1376673335 |
| 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 2026-10-02, retrieved 2026-10-29
- 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