2026 NPPES data Addiction Psychiatry Physician NPI 1578901500 MD
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JAMES WALKER, MD

Addiction Psychiatry Physician in GREER, South Carolina. 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
625
Medicare Part D claims · 114 beneficiaries · Addiction Psychiatry Physician avg: 792
Industry payments
$20.73
1 payments · CMS Open Payments (Sunshine Act)
What the federal data reveals: JAMES WALKER, MD is a Addiction Psychiatry Physician ([object Object]) practicing in GREER, South Carolina with a Medicare Part D prescribing footprint of 625 claims across 114 beneficiaries . Industry payments of $20.73 across 1 transactions are disclosed under CMS Open Payments (Sunshine Act).

What stands out: JAMES WALKER, MD filed 625 Medicare Part D claims in 2023 across GREER, South Carolina. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

JAMES WALKER, MD 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).

JAMES WALKER, MD at a glance

Quality data not reported

NPI registry status

Active

Issued 06/12/2013

NPI 1578901500

Primary specialty

Addiction Psychiatry Physician

Niche

667 US NPIs in this specialty

Medicare Part D claims

625 21% vs specialty avg

2023 prescription claims

Specialty avg: 792

Specialty distribution in South Carolina

How Addiction Psychiatry Physician compares to other specialties among South Carolina providers

South Carolina providers

Addiction Psychiatry Physician share within South Carolina

1. Addiction Psychiatry Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Addiction Psychiatry Physician share within South Carolina

Specialty board-certification context

Estimated specialty board-certified rate — Addiction Psychiatry Physician (ABMS / AOA reference)

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

Est. board-certified rate (Addiction Psychiatry Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Addiction Psychiatry 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).

JAMES WALKER, MD is a Addiction Psychiatry Physician provider practicing in GREER, South Carolina, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: MD. NPI: 1578901500. 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.

JAMES WALKER, MD appears in the CMS NPPES registry as a Addiction Psychiatry Physician provider holding MD credentials at 2700 E PHILLIPS RD, GREER, SC, 29650, with a listed phone of (864) 235-2335. NPI 1578901500 was issued on 06/12/2013. 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 625 prescription claims written by this provider, covering 114 Medicare beneficiaries and totaling roughly $11K 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.

Addiction Psychiatry Physician is a narrow specialty nationwide, with 667 enrolled providers across 49 states and an average of 792 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

2700 E PHILLIPS RD
GREER, SC 29650

Provider Details

NPI 1578901500
Specialty Addiction Psychiatry Physician
Credentials MD
Gender Male
NPI Issued 06/12/2013

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.

UHS OF GREENVILLE, LLC
GREER, SC

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

$21

Largest payer

IDORSIA PHARMACEUTICALS US INC

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 2023.

625
Total Claims
$11K
Total Drug Cost
114
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
639
Total Day Supply
10,692
Generic Drug Cost
$8K
Antibiotic Claims
16

Patient Demographics

Average Patient Age
54.0 years
Avg HCC Risk Score
1.35
Gender Split
44% female / 56% male
Age Distribution
<65: 89, 65-74: 23, 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
Gabapentin
42
Naltrexone Hcl
42
Mirtazapine
41
Quetiapine Fumarate
35
Trazodone Hcl
26
Hydroxyzine Pamoate
24
Sertraline Hcl
23
Buprenorphine-Naloxone
Buprenorphine Hcl/Naloxone Hcl
22
Escitalopram Oxalate
22
Lamotrigine
15

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

Addiction Psychiatry Physician Overview

How JAMES WALKER, MD fits within the Addiction Psychiatry Physician landscape nationally.

667
Addiction Psychiatry Physician Providers in US
49
States with Addiction Psychiatry Physician
792
Avg Claims per Provider

JAMES WALKER, MD's 625 claims are below the specialty average of 792.

Nearby Addiction Psychiatry Physician Providers in South Carolina

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

Compare Addiction Psychiatry Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is JAMES WALKER, MD's specialty?
JAMES WALKER, MD specializes in Addiction Psychiatry Physician and practices in GREER, South Carolina. Credentials: MD.
How much does JAMES WALKER, MD prescribe under Medicare Part D?
In 2023, JAMES WALKER, MD wrote 625 Medicare Part D claims totaling $11K in drug costs for 114 beneficiaries.
Where is JAMES WALKER, MD located?
JAMES WALKER, MD is located at 2700 E PHILLIPS RD, GREER, SC, 29650. Phone: (864) 235-2335.
What is JAMES WALKER, MD's NPI number?
JAMES WALKER, MD's National Provider Identifier (NPI) is 1578901500, issued on 06/12/2013.
How many Addiction Psychiatry Physician providers are there in the US?
There are 667 Addiction Psychiatry Physician providers across 49 states in the US. The average Addiction Psychiatry Physician provider writes 792 Medicare Part D claims per year.
What drugs does JAMES WALKER, MD prescribe most often?
Based on 2023 Medicare Part D data, JAMES WALKER, MD's most frequently prescribed drugs include Gabapentin, Naltrexone Hcl, Mirtazapine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does JAMES WALKER, MD accept Medicare?
JAMES WALKER, MD appears in CMS Medicare data with 625 Part D claims and 114 Medicare beneficiaries in 2023. 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 1578901500 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