PlainDoctor

2026 NPPES data Undersea and Hyperbaric Medicine (Emergency Medicine) Physician NPI 1700091477 MD
Verify on CMS →

James Walker, MD

Undersea and Hyperbaric Medicine (Emergency Medicine) Physician in Memphis, Tennessee.

This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 204 in Undersea and Hyperbaric Medicine (Emergency Medicine) Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.

Federal data, no proprietary rating. We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
42
Medicare Part D claims · 27 beneficiaries · Undersea and Hyperbaric Medicine (Emergency Medicine) Physician avg: 405
MIPS score
75.1/100
▼ 8 pts below national avg 83.5 · Above neutral
Industry payments
$18.8
1 payments · CMS Open Payments (Sunshine Act)
Verify NPI on CMS Methodology
Compiled from official public sources by the editorial process.

What the federal data shows

James Walker, MD reported a CMS MIPS final score of 75.1/100 - below the 83.5 national average - and filed 42 Medicare Part D claims in 2024.

75.1/100
MIPS score · -8 vs avg
42
Part D claims, 2024
Likely
board-certified (heuristic)
≥15th
pct among measured MIPS (lower-bound band)

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.

Federal trust snapshot

What official records show about James Walker, MD

Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.

  • Verified

    NPI registry status

    Active listing in the CMS National Provider Identifier Registry (NPI 1700091477), first enumerated 05/14/2007.

    Source: CMS NPPES

  • Reported

    Medicare Part D participation

    Filed 42 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.

    Source: CMS Part D Prescriber PUF

  • Reported

    CMS quality reporting (MIPS)

    Reported a CMS MIPS final score of 75.1/100 in the Quality Payment Program — a federal quality measure, not a patient review.

    Source: CMS Quality Payment Program

  • Reported

    Board certification signal

    Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.

    Source: NUCC taxonomy + CMS participation heuristic

  • Reported

    Hospital affiliations

    1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.

    Source: CMS Care Compare

  • Reported

    Industry payment transparency

    $18.8 in reported industry payments (1 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.

    Source: CMS Open Payments

  • Not in federal data

    Individual sanction lookup

    PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.

    Source: State medical board / FSMB

This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.

CMS NPPES provider registry desk

NPI 1700091477 · Undersea and Hyperbaric Medicine (Emergency Medicine) Physician

NPI-10 · ENUM-MID · TAX-TRACE · MIPS-BELOW · RX-TRACE · BOOK-THIN · PHOTO-FINISH

  • NPI-10 1700091477
  • ENUM-MID 2007
  • TAX-TRACE 204
  • MIPS-BELOW 75.1/100
  • RX-TRACE 42
  • BOOK-THIN 3 in Tennessee
  • PHOTO-FINISH Shaun Carpenter · ±0.1

MIPS final-score neighbourhood

Same-specialty nationwide peers by CMS final score, not geographic proximity

MIPS pts

What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).

Source CMS Quality Payment Program (MIPS) As of 2023

James Walker, MD's MIPS score vs every measured U.S. clinician

CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.

75 ≥ 15th percentile 15% of 454,083 measured providers are in lower value bands

0–10: 8,684 measured providers (2%). Below this entry. 10–20: 3,008 measured providers (1%). Below this entry. 20–30: 3,069 measured providers (1%). Below this entry. 30–40: 2,746 measured providers (1%). Below this entry. 40–50: 2,928 measured providers (1%). Below this entry. 50–60: 5,882 measured providers (1%). Below this entry. 60–70: 13,906 measured providers (3%). Below this entry. 70–80: 94,570 measured providers (21%). This entry sits in this band. 80–90: 129,887 measured providers (29%). Above this entry. 90+: 189,403 measured providers (42%). Above this entry. This provider 0 100 every measured MIPS clinician, bucketed by value

Each bar is a band; taller bars hold more measured providers. 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.

The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.

Source CMS Merit-based Incentive Payment System (MIPS) · 2023

Where James Walker, MD sits

This provider among undersea and hyperbaric medicine (emergency medicine) physician peers

Across the 41 undersea and hyperbaric medicine (emergency medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, James Walker, MD writes more Part D claims than 27% of them and scores higher on MIPS quality than 7% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.

Lower volume · High qualityHigh volume · High qualityLower volume · Lower qualityHigh volume · Lower quality02550751000255075100Part D claim volume, percentile in specialtyMIPS quality, percentilePoint, Part D claim volume, percentile in specialty: 83 · MIPS quality, percentile: 23Point, Part D claim volume, percentile in specialty: 90 · MIPS quality, percentile: 15Point, Part D claim volume, percentile in specialty: 20 · MIPS quality, percentile: 43Point, Part D claim volume, percentile in specialty: 5 · MIPS quality, percentile: 78Point, Part D claim volume, percentile in specialty: 33 · MIPS quality, percentile: 20Point, Part D claim volume, percentile in specialty: 43 · MIPS quality, percentile: 40Point, Part D claim volume, percentile in specialty: 78 · MIPS quality, percentile: 65Point, Part D claim volume, percentile in specialty: 38 · MIPS quality, percentile: 98Point, Part D claim volume, percentile in specialty: 30 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 10 · MIPS quality, percentile: 10Point, Part D claim volume, percentile in specialty: 15 · MIPS quality, percentile: 30Point, Part D claim volume, percentile in specialty: 98 · MIPS quality, percentile: 0Point, Part D claim volume, percentile in specialty: 53 · MIPS quality, percentile: 95Point, Part D claim volume, percentile in specialty: 65 · MIPS quality, percentile: 28Point, Part D claim volume, percentile in specialty: 68 · MIPS quality, percentile: 83Point, Part D claim volume, percentile in specialty: 45 · MIPS quality, percentile: 33Point, Part D claim volume, percentile in specialty: 18 · MIPS quality, percentile: 35Point, Part D claim volume, percentile in specialty: 85 · MIPS quality, percentile: 63Point, Part D claim volume, percentile in specialty: 0 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 93 · MIPS quality, percentile: 88Point, Part D claim volume, percentile in specialty: 48 · MIPS quality, percentile: 43Point, Part D claim volume, percentile in specialty: 73 · MIPS quality, percentile: 83Point, Part D claim volume, percentile in specialty: 20 · MIPS quality, percentile: 98Point, Part D claim volume, percentile in specialty: 50 · MIPS quality, percentile: 3Point, Part D claim volume, percentile in specialty: 13 · MIPS quality, percentile: 55Point, Part D claim volume, percentile in specialty: 63 · MIPS quality, percentile: 88Point, Part D claim volume, percentile in specialty: 75 · MIPS quality, percentile: 13Point, Part D claim volume, percentile in specialty: 60 · MIPS quality, percentile: 50Point, Part D claim volume, percentile in specialty: 88 · MIPS quality, percentile: 88Point, Part D claim volume, percentile in specialty: 8 · MIPS quality, percentile: 5Point, Part D claim volume, percentile in specialty: 100 · MIPS quality, percentile: 70Point, Part D claim volume, percentile in specialty: 95 · MIPS quality, percentile: 23Point, Part D claim volume, percentile in specialty: 55 · MIPS quality, percentile: 68Point, Part D claim volume, percentile in specialty: 35 · MIPS quality, percentile: 57Point, Part D claim volume, percentile in specialty: 70 · MIPS quality, percentile: 80Point, Part D claim volume, percentile in specialty: 3 · MIPS quality, percentile: 43Point, Part D claim volume, percentile in specialty: 20 · MIPS quality, percentile: 60Point, Part D claim volume, percentile in specialty: 80 · MIPS quality, percentile: 53Point, Part D claim volume, percentile in specialty: 57 · MIPS quality, percentile: 18Point, Part D claim volume, percentile in specialty: 40 · MIPS quality, percentile: 38James Walker, MD, Part D claim volume, percentile in specialty: 27 · MIPS quality, percentile: 7
Part D claim volume vs MIPS quality, by specialty percentile

Each dot is one undersea and hyperbaric medicine (emergency medicine) physician peer from a representative sample of 40; the gold marker is James Walker, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.

✓
Board certification likely (heuristic, not verified)

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

What does the federal data show about James Walker, MD?

Below national average

NPI registry status

Active

Issued 05/14/2007

NPI 1700091477

Primary specialty

Undersea and Hyperbaric Medicine (Emergency Medicine) Physician

Rare

204 US NPIs in this specialty

Medicare Part D claims

42 90% vs specialty avg

2024 prescription claims

Specialty avg: 405

MIPS final score

75.1/100 8.4 pts vs avg

Above neutral band

vs 83.5 national avg

Specialty distribution in Tennessee

How Undersea and Hyperbaric Medicine (Emergency Medicine) Physician compares to other specialties among Tennessee providers

Tennessee providers
Family Nurse Practitioner6.4%Pharmacist5.8%Student in an Organized Heal…4.7%Behavior Technician4.5%Physical Therapist4.2%Registered Nurse3.9%Undersea and Hyperbaric Medi…0%
Largest specialties in Tennessee (% of in-state providers)

Medicare quality performance, MIPS

James Walker, MD's 2023 MIPS final score plotted against the Undersea and Hyperbaric Medicine (Emergency Medicine) Physician national average

Below national average
MIPS Final Score
75.1/100
vs 83.5 national avg · 2023 performance year
0%100%National avg84%75.1%
MIPS final score (Undersea and Hyperbaric Medicine (Emergency Medicine) Physician) - 75.1/100 vs national avg 83.5
How MIPS and board certification work

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).

Practice Address

1265 UNION AVE
Memphis, TN 38104
(901) 516-7600

Provider Details

NPI 1700091477
Specialty Undersea and Hyperbaric Medicine (Emergency Medicine) Physician
Credentials MD
Gender Male
NPI Issued 05/14/2007

CMS Quality Score (MIPS)

Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.

75.0659
Final Score
Measured-score avg: 83.5
56.4669
Quality
71.8772
Cost

Reporting: Group practice

Hospital and facility affiliations

Facilities where James Walker, MD 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.

Methodist University Emergency Physicians PLLC
Memphis, TN

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

Industry payments received (2024) - CMS Open Payments transparency data

The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for James Walker, MD. Source: openpaymentsdata.cms.gov.

Total received

$19

Largest payer

Boston Scientific Corporation

Most common payment type

Food and Beverage

Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2024.

42
Total Claims
$341
Total Drug Cost
27
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
44.667
Total Day Supply
513
Generic Drug Cost
$265
Antibiotic Claims
13

Patient Demographics

Average Patient Age
70.8 years
Avg HCC Risk Score
2.23
More Undersea and Hyperbaric Medicine (Emergency Medicine) Physician in TN → All providers in Tennessee → Compare specialties →

Undersea and Hyperbaric Medicine (Emergency Medicine) Physician Overview

How James Walker, MD fits within the Undersea and Hyperbaric Medicine (Emergency Medicine) Physician landscape nationally.

204
Undersea and Hyperbaric Medicine (Emergency Medicine) Physician Providers in US
41
States with Undersea and Hyperbaric Medicine (Emergency Medicine) Physician
405
Avg Claims per Provider

James Walker, MD's 42 claims are below the specialty average of 405.

Nationwide Undersea and Hyperbaric Medicine (Emergency Medicine) Physician peers with similar MIPS or enrollment year

Two federal-record peer sets for Walker, both outside Tennessee so the neighborhoods are not geographic containment.

Similar MIPS final score

Nearest same-specialty clinicians by CMS MIPS final score (75.1 here).

Craig Goldstein 75 MO Shaun Carpenter 75.2 LA Phi-Nga Le 75 TX Kenneth Newman 77.3 KS

Same NPPES enumeration year (2007)

Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.

John Thompson Arlington, TX Kenneth Kelly San Diego, CA Michael Madsen Tripler Army Medical Center, HI Long Hoang Fort Worth, TX

Nearby Undersea and Hyperbaric Medicine (Emergency Medicine) Physician Providers in Tennessee

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

One of 3 Undersea and Hyperbaric Medicine (Emergency Medicine) Physician providers enrolled in Tennessee, 2 are shown here.

Dr. Christopher Bell
M.D.
Crossville, TN
John Carter
Dayton, TN

Compare Undersea and Hyperbaric Medicine (Emergency Medicine) Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is James Walker, MD's specialty? ▼
James Walker, MD specializes in Undersea and Hyperbaric Medicine (Emergency Medicine) Physician and practices in Memphis, Tennessee. Credentials: MD.
How much does James Walker, MD prescribe under Medicare Part D? ▼
In 2024, James Walker, MD wrote 42 Medicare Part D claims totaling $341 in drug costs for 27 beneficiaries.
What is James Walker, MD's Medicare quality score? ▼
James Walker, MD has a CMS MIPS Final Score of 75.1/100 (Quality: 56.5, Cost: 71.9). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is James Walker, MD located? ▼
James Walker, MD is located at 1265 UNION AVE, Memphis, TN, 38104. Phone: (901) 516-7600.
What is James Walker, MD's NPI number? ▼
James Walker, MD's National Provider Identifier (NPI) is 1700091477, issued on 05/14/2007.
How many Undersea and Hyperbaric Medicine (Emergency Medicine) Physician providers are there in the US? ▼
There are 204 Undersea and Hyperbaric Medicine (Emergency Medicine) Physician providers across 41 states in the US. The average Undersea and Hyperbaric Medicine (Emergency Medicine) Physician provider writes 405 Medicare Part D claims per year.
Does James Walker, MD accept Medicare? ▼
James Walker, MD appears in CMS Medicare data with 42 Part D claims and 27 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify James Walker, MD's credentials? ▼
James Walker, MD's NPI is 1700091477 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

View source datasets and methodology notes
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 (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
Quality Performance
CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
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 August 2026 (NPPES) / 2024 (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

Compiled from official public sources by the editorial process.

Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.