2026 NPPES data Maternal & Fetal Medicine Physician NPI 1538120100 MD
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JOSEPH HARRIS, MD

Maternal & Fetal Medicine Physician in PHOENIX, Arizona. 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
18
Medicare Part D claims · Maternal & Fetal Medicine Physician avg: 75
What the federal data reveals: JOSEPH HARRIS, MD is a Maternal & Fetal Medicine Physician ([object Object]) practicing in PHOENIX, Arizona with a Medicare Part D prescribing footprint of 18 claims .

What stands out: JOSEPH HARRIS, MD filed 18 Medicare Part D claims in 2023 across PHOENIX, Arizona. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board-eligible specialty (heuristic — not verified)

JOSEPH HARRIS, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).

JOSEPH HARRIS, MD at a glance

Quality data not reported

NPI registry status

Active

Issued 03/31/2006

NPI 1538120100

Primary specialty

Maternal & Fetal Medicine Physician

Niche

2,103 US NPIs in this specialty

Medicare Part D claims

18 76% vs specialty avg

2023 prescription claims

Specialty avg: 75

Specialty distribution in Arizona

How Maternal & Fetal Medicine Physician compares to other specialties among Arizona providers

Arizona providers

Maternal & Fetal Medicine Physician share within Arizona

1. Maternal & Fetal Medicine Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Maternal & Fetal Medicine Physician share within Arizona

Specialty board-certification context

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

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

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

0%100%78%
Est. board-certified rate (Maternal & Fetal Medicine 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).

JOSEPH HARRIS, MD is a Maternal & Fetal Medicine Physician provider practicing in PHOENIX, Arizona, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: MD. NPI: 1538120100. 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.

JOSEPH HARRIS, MD appears in the CMS NPPES registry as a Maternal & Fetal Medicine Physician provider holding MD credentials at 500 W THOMAS RD, PHOENIX, AZ, 85013, with a listed phone of (602) 406-7048. NPI 1538120100 was issued on 03/31/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what HARRIS 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 18 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $122 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.

Maternal & Fetal Medicine Physician is a narrow specialty nationwide, with 2,103 enrolled providers across 52 states and an average of 75 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

500 W THOMAS RD
PHOENIX, AZ 85013

Provider Details

NPI 1538120100
Specialty Maternal & Fetal Medicine Physician
Credentials MD
Gender Male
NPI Issued 03/31/2006

Medicare Part D Prescribing Data

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

18
Total Claims
$122
Total Drug Cost
N/A
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
46
Total Day Supply
1,295
Generic Drug Cost
$110

Patient Demographics

Average Patient Age
75.0 years
Avg HCC Risk Score
1.61

Maternal & Fetal Medicine Physician Overview

How JOSEPH HARRIS, MD fits within the Maternal & Fetal Medicine Physician landscape nationally.

2,103
Maternal & Fetal Medicine Physician Providers in US
52
States with Maternal & Fetal Medicine Physician
75
Avg Claims per Provider

JOSEPH HARRIS, MD's 18 claims are below the specialty average of 75.

Nearby Maternal & Fetal Medicine Physician Providers in Arizona

Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as HARRIS.

Compare Maternal & Fetal Medicine Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is JOSEPH HARRIS, MD's specialty?
JOSEPH HARRIS, MD specializes in Maternal & Fetal Medicine Physician and practices in PHOENIX, Arizona. Credentials: MD.
How much does JOSEPH HARRIS, MD prescribe under Medicare Part D?
In 2023, JOSEPH HARRIS, MD wrote 18 Medicare Part D claims totaling $122 in drug costs for N/A beneficiaries.
Where is JOSEPH HARRIS, MD located?
JOSEPH HARRIS, MD is located at 500 W THOMAS RD, PHOENIX, AZ, 85013. Phone: (602) 406-7048.
What is JOSEPH HARRIS, MD's NPI number?
JOSEPH HARRIS, MD's National Provider Identifier (NPI) is 1538120100, issued on 03/31/2006.
How many Maternal & Fetal Medicine Physician providers are there in the US?
There are 2,103 Maternal & Fetal Medicine Physician providers across 52 states in the US. The average Maternal & Fetal Medicine Physician provider writes 75 Medicare Part D claims per year.
Does JOSEPH HARRIS, MD accept Medicare?
JOSEPH HARRIS, MD appears in CMS Medicare data with 18 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 JOSEPH HARRIS, MD's credentials?
JOSEPH HARRIS, MD's NPI is 1538120100 with credentials MD. 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