2026 NPPES data Physical Medicine & Rehabilitation Physician NPI 1093796955 MD, PHD
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WALTER FRONTERA, MD, PHD

Physical Medicine & Rehabilitation Physician in SAN JUAN, Puerto Rico. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
30
Medicare Part D claims · Physical Medicine & Rehabilitation Physician avg: 781
What the federal data reveals: WALTER FRONTERA, MD, PHD is a Physical Medicine & Rehabilitation Physician ([object Object]) practicing in SAN JUAN, Puerto Rico with a Medicare Part D prescribing footprint of 30 claims .

What stands out: WALTER FRONTERA, MD, PHD filed 30 Medicare Part D claims in 2023 across SAN JUAN, Puerto Rico. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

WALTER FRONTERA, MD, PHD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation — signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

WALTER FRONTERA, MD, PHD at a glance

Quality data not reported

NPI registry status

Active

Issued 11/08/2005

NPI 1093796955

Primary specialty

Physical Medicine & Rehabilitation Physician

Mid-sized

15,306 US NPIs in this specialty

Medicare Part D claims

30 96% vs specialty avg

2023 prescription claims

Specialty avg: 781

Specialty distribution in Puerto Rico

How Physical Medicine & Rehabilitation Physician compares to other specialties among Puerto Rico providers

Puerto Rico providers

Physical Medicine & Rehabilitation Physician share within Puerto Rico

1. Physical Medicine & Rehabilitation Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Physical Medicine & Rehabilitation Physician share within Puerto Rico

Specialty board-certification context

Estimated specialty board-certified rate — Physical Medicine & Rehabilitation Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Physical Medicine & Rehabilitation Physician ABMS/AOA estimate

Est. board-certified rate (Physical Medicine & Rehabilitation Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Physical Medicine & Rehabilitation Physician) — ABMS / AOA estimate

The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.

Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).

WALTER FRONTERA, MD, PHD is a Physical Medicine & Rehabilitation Physician provider practicing in SAN JUAN, Puerto Rico, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: MD, PHD. NPI: 1093796955. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

WALTER FRONTERA, MD, PHD appears in the CMS NPPES registry as a Physical Medicine & Rehabilitation Physician provider holding MD, PHD credentials at 2 CALLE AZUCENA, SAN JUAN, PR, 00927, with a listed phone of (787) 309-5060. NPI 1093796955 was issued on 11/08/2005. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what FRONTERA most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 30 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $511 in drug spend. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Physical Medicine & Rehabilitation Physician is a mid-sized specialty nationwide, with 15,306 enrolled providers across 54 states and an average of 781 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline. Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist — always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.

Practice Address

2 CALLE AZUCENA
SAN JUAN, PR 00927

Provider Details

NPI 1093796955
Specialty Physical Medicine & Rehabilitation Physician
Credentials MD, PHD
Gender Male
NPI Issued 11/08/2005

Hospital and facility affiliations

Facilities where WALTER FRONTERA, MD, PHD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" — a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.

RECINTO DE CIENCIAS MEDICAS
RIO PIEDRAS, PR

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

30
Total Claims
$511
Total Drug Cost
N/A
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
34
Total Day Supply
886
Generic Drug Cost
$272

Patient Demographics

Average Patient Age
73.0 years
Avg HCC Risk Score
0.77

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

Drug Claims
Sulindac
12

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Physical Medicine & Rehabilitation Physician Overview

How WALTER FRONTERA, MD, PHD fits within the Physical Medicine & Rehabilitation Physician landscape nationally.

15,306
Physical Medicine & Rehabilitation Physician Providers in US
54
States with Physical Medicine & Rehabilitation Physician
781
Avg Claims per Provider

WALTER FRONTERA, MD, PHD's 30 claims are below the specialty average of 781.

Nearby Physical Medicine & Rehabilitation Physician Providers in Puerto Rico

Other clinicians with the same primary specialty enrolled in Puerto Rico, drawn from the same CMS NPPES roster as FRONTERA.

Compare Physical Medicine & Rehabilitation Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is WALTER FRONTERA, MD, PHD's specialty?
WALTER FRONTERA, MD, PHD specializes in Physical Medicine & Rehabilitation Physician and practices in SAN JUAN, Puerto Rico. Credentials: MD, PHD.
How much does WALTER FRONTERA, MD, PHD prescribe under Medicare Part D?
In 2023, WALTER FRONTERA, MD, PHD wrote 30 Medicare Part D claims totaling $511 in drug costs for N/A beneficiaries.
Where is WALTER FRONTERA, MD, PHD located?
WALTER FRONTERA, MD, PHD is located at 2 CALLE AZUCENA, SAN JUAN, PR, 00927. Phone: (787) 309-5060.
What is WALTER FRONTERA, MD, PHD's NPI number?
WALTER FRONTERA, MD, PHD's National Provider Identifier (NPI) is 1093796955, issued on 11/08/2005.
How many Physical Medicine & Rehabilitation Physician providers are there in the US?
There are 15,306 Physical Medicine & Rehabilitation Physician providers across 54 states in the US. The average Physical Medicine & Rehabilitation Physician provider writes 781 Medicare Part D claims per year.
What drugs does WALTER FRONTERA, MD, PHD prescribe most often?
Based on 2023 Medicare Part D data, WALTER FRONTERA, MD, PHD's most frequently prescribed drugs include Sulindac. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does WALTER FRONTERA, MD, PHD accept Medicare?
WALTER FRONTERA, MD, PHD appears in CMS Medicare data with 30 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify WALTER FRONTERA, MD, PHD's credentials?
WALTER FRONTERA, MD, PHD's NPI is 1093796955 with credentials MD, PHD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.

Data Sources

Provider Directory
CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
Specialty Classification
NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
Prescribing Data
CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
Limitations
Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.

See our complete data methodology for details on how we collect and process government data.

Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).

Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology