2026 NPPES data Pharmacist NPI 1558535187 PHARMD
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JOHN FLAHERTY, PHARMD

Pharmacist in NEWARK, Delaware. 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
11
Medicare Part D claims · 11 beneficiaries · Pharmacist avg: 135
Generic prescribing
0%
generic claims · 100% brand-name · higher generic rates reduce patient out-of-pocket costs
What the federal data reveals: JOHN FLAHERTY, PHARMD is a Pharmacist ([object Object]) practicing in NEWARK, Delaware with a Medicare Part D prescribing footprint of 11 claims across 11 beneficiaries — 100% brand-name prescribing .

What stands out: JOHN FLAHERTY, PHARMD filed 11 Medicare Part D claims in 2023 across NEWARK, Delaware. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

JOHN FLAHERTY, PHARMD at a glance

Quality data not reported

NPI registry status

Active

Issued 04/15/2008

NPI 1558535187

Primary specialty

Pharmacist

High-volume

290,447 US NPIs in this specialty

Medicare Part D claims

11 92% vs specialty avg

2023 prescription claims

Specialty avg: 135

Specialty distribution in Delaware

How Pharmacist compares to other specialties among Delaware providers

Delaware providers

Pharmacist share within Delaware

1. Pharmacist42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Pharmacist share within Delaware

Specialty board-certification context

Estimated specialty board-certified rate — Pharmacist (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Pharmacist ABMS/AOA estimate

Est. board-certified rate (Pharmacist) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Pharmacist) — 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).

JOHN FLAHERTY, PHARMD is a Pharmacist provider practicing in NEWARK, Delaware, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: PHARMD. NPI: 1558535187. 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.

JOHN FLAHERTY, PHARMD appears in the CMS NPPES registry as a Pharmacist provider holding PHARMD credentials at 4755 STANTON-OGLETOWN RD CHRISTIANA CARE PHARMACY, NEWARK, DE, 19718, with a listed phone of (302) 733-2864. NPI 1558535187 was issued on 04/15/2008. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what FLAHERTY 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 11 prescription claims written by this provider, covering 11 Medicare beneficiaries and totaling roughly $3K in drug spend, split 100% brand-name and 0% generic by claim count. 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.

Pharmacist is a high-volume specialty nationwide, with 290,447 enrolled providers across 56 states and an average of 135 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

4755 STANTON-OGLETOWN RD CHRISTIANA CARE PHARMACY
NEWARK, DE 19718

Provider Details

NPI 1558535187
Specialty Pharmacist
Credentials PHARMD
Gender Male
NPI Issued 04/15/2008

Brand vs generic prescribing mix · Brand-heavy

JOHN FLAHERTY, PHARMD — brand share 100.0%
Specialty average (est.)

100% brand-name claims vs 0% generic, on 11 2023 Medicare Part D claims.

The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.

Medicare Part D Prescribing Data

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

11
Total Claims
$3K
Total Drug Cost
11
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
11
Total Day Supply
11
Brand vs Generic
100% brand / 0% generic
Brand Drug Cost
$3K
Generic Drug Cost
$0

Patient Demographics

Average Patient Age
77.9 years
Avg HCC Risk Score
0.89
Age Distribution
<65: 0, 65-74: N/A, 75-84: N/A, 85+: N/A

Pharmacist Overview

How JOHN FLAHERTY, PHARMD fits within the Pharmacist landscape nationally.

290,447
Pharmacist Providers in US
56
States with Pharmacist
135
Avg Claims per Provider

JOHN FLAHERTY, PHARMD's 11 claims are below the specialty average of 135.

Nearby Pharmacist Providers in Delaware

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

Compare Pharmacist nationally: see state-by-state distribution →

Frequently Asked Questions

What is JOHN FLAHERTY, PHARMD's specialty?
JOHN FLAHERTY, PHARMD specializes in Pharmacist and practices in NEWARK, Delaware. Credentials: PHARMD.
How much does JOHN FLAHERTY, PHARMD prescribe under Medicare Part D?
In 2023, JOHN FLAHERTY, PHARMD wrote 11 Medicare Part D claims totaling $3K in drug costs for 11 beneficiaries.
Where is JOHN FLAHERTY, PHARMD located?
JOHN FLAHERTY, PHARMD is located at 4755 STANTON-OGLETOWN RD CHRISTIANA CARE PHARMACY, NEWARK, DE, 19718. Phone: (302) 733-2864.
What is JOHN FLAHERTY, PHARMD's NPI number?
JOHN FLAHERTY, PHARMD's National Provider Identifier (NPI) is 1558535187, issued on 04/15/2008.
Does JOHN FLAHERTY, PHARMD prescribe more brand-name or generic drugs?
JOHN FLAHERTY, PHARMD's prescribing is 100% brand-name and 0% generic drugs by claim count, with $3K in brand drug costs.
How many Pharmacist providers are there in the US?
There are 290,447 Pharmacist providers across 56 states in the US. The average Pharmacist provider writes 135 Medicare Part D claims per year.
Does JOHN FLAHERTY, PHARMD accept Medicare?
JOHN FLAHERTY, PHARMD appears in CMS Medicare data with 11 Part D claims and 11 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify JOHN FLAHERTY, PHARMD's credentials?
JOHN FLAHERTY, PHARMD's NPI is 1558535187 with credentials PHARMD. 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