2026 NPPES data Pediatric Hematology & Oncology Physician NPI 1457538712 MD
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JENNIFER WALKER, MD

Pediatric Hematology & Oncology Physician in LARGO, Florida. 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
135
Medicare Part D claims · 14 beneficiaries · Pediatric Hematology & Oncology Physician avg: 92

What the federal data shows

JENNIFER WALKER, MD filed 135 Medicare Part D claims in 2023 as a Pediatric Hematology & Oncology Physician in LARGO, Florida.

135
Part D claims, 2023

Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) — no proprietary rating or editorial opinion is applied.

JENNIFER WALKER, MD's Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

135 35th percentile higher than 35% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). This entry sits in this band. 200–400: 182,923 prescribers (13%). Above this entry. 400–600: 90,619 prescribers (7%). Above this entry. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source CMS Medicare Part D Prescriber Public Use File · 2023

Board-eligible specialty (heuristic — not verified)

JENNIFER WALKER, 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).

What does the federal data show about JENNIFER WALKER, MD?

Quality data not reported

NPI registry status

Active

Issued 01/29/2008

NPI 1457538712

Primary specialty

Pediatric Hematology & Oncology Physician

Niche

2,568 US NPIs in this specialty

Medicare Part D claims

135 47% vs specialty avg

2023 prescription claims

Specialty avg: 92

Specialty distribution in Florida

How Pediatric Hematology & Oncology Physician compares to other specialties among Florida providers

Florida providers

Pediatric Hematology & Oncology Physician share within Florida

1. Pediatric Hematology & Oncology Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Pediatric Hematology & Oncology Physician share within Florida

Specialty board-certification context

Estimated specialty board-certified rate — Pediatric Hematology & Oncology Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Pediatric Hematology & Oncology Physician ABMS/AOA estimate

Est. board-certified rate (Pediatric Hematology & Oncology Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Pediatric Hematology & Oncology 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).

JENNIFER WALKER, MD appears in the CMS NPPES registry as a Pediatric Hematology & Oncology Physician provider holding MD credentials at 13220 STARKEY RD STE 500, LARGO, FL, 33773, with a listed phone of (727) 398-7701. NPI 1457538712 was issued on 01/29/2008. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what WALKER 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 135 prescription claims written by this provider, covering 14 Medicare beneficiaries and totaling roughly $1K 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.

Pediatric Hematology & Oncology Physician is a narrow specialty nationwide, with 2,568 enrolled providers across 52 states and an average of 92 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

13220 STARKEY RD STE 500
LARGO, FL 33773

Provider Details

NPI 1457538712
Specialty Pediatric Hematology & Oncology Physician
Credentials MD
Gender Female
NPI Issued 01/29/2008

License & disciplinary context — Florida FLDOH 2023 annual report

Aggregate state board data only — NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~75K Florida medical licensees in 2023 — they are NOT specific to JENNIFER WALKER, MD. To verify JENNIFER WALKER, MD's current license status, search the FLDOH public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.

480
Total board actions, Florida 2023
Across 467 cases
6.40
Actions per 1,000 licensees
Florida statewide rate
monetary fine
Most common action type
138 cases

FLDOH publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Florida disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.

Medicare Part D Prescribing Data

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

135
Total Claims
$1K
Total Drug Cost
14
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
389
Total Day Supply
11,700
Generic Drug Cost
$1K

Patient Demographics

Average Patient Age
76.7 years
Avg HCC Risk Score
1.18
Gender Split
0% female / 100% male
Age Distribution
<65: 0, 65-74: N/A, 75-84: N/A, 85+: N/A

Top Prescribed Drugs (Medicare Part D)

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

Drug Claims
Lisinopril
11

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

Pediatric Hematology & Oncology Physician Overview

How JENNIFER WALKER, MD fits within the Pediatric Hematology & Oncology Physician landscape nationally.

2,568
Pediatric Hematology & Oncology Physician Providers in US
52
States with Pediatric Hematology & Oncology Physician
92
Avg Claims per Provider

JENNIFER WALKER, MD's 135 claims are above the specialty average of 92.

Nearby Pediatric Hematology & Oncology Physician Providers in Florida

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

Compare Pediatric Hematology & Oncology Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is JENNIFER WALKER, MD's specialty?
JENNIFER WALKER, MD specializes in Pediatric Hematology & Oncology Physician and practices in LARGO, Florida. Credentials: MD.
How much does JENNIFER WALKER, MD prescribe under Medicare Part D?
In 2023, JENNIFER WALKER, MD wrote 135 Medicare Part D claims totaling $1K in drug costs for 14 beneficiaries.
Where is JENNIFER WALKER, MD located?
JENNIFER WALKER, MD is located at 13220 STARKEY RD STE 500, LARGO, FL, 33773. Phone: (727) 398-7701.
What is JENNIFER WALKER, MD's NPI number?
JENNIFER WALKER, MD's National Provider Identifier (NPI) is 1457538712, issued on 01/29/2008.
How many Pediatric Hematology & Oncology Physician providers are there in the US?
There are 2,568 Pediatric Hematology & Oncology Physician providers across 52 states in the US. The average Pediatric Hematology & Oncology Physician provider writes 92 Medicare Part D claims per year.
What drugs does JENNIFER WALKER, MD prescribe most often?
Based on 2023 Medicare Part D data, JENNIFER WALKER, MD's most frequently prescribed drugs include Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does JENNIFER WALKER, MD accept Medicare?
JENNIFER WALKER, MD appears in CMS Medicare data with 135 Part D claims and 14 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify JENNIFER WALKER, MD's credentials?
JENNIFER WALKER, MD's NPI is 1457538712 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