Dr. John D. Day, MD

  • Little Rock, AR
  • Neurosurgeon
NPI1043310006PAC ID4688667868
Medicare services, 2024
16
Medicare patients, 2024
32
Part D claims, 2024
109
Publications
6
Hospital affiliations
2
Practice address
4301 West Markham Street Mail Slot 612, Little Rock, AR 72205
Practice phone
Call (501) 686-5000
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

UAMS Medical Center

Hospital · Little Rock, Arkansas

See all 8 affiliations

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Dr. John D. Day is a neurosurgeon in Little Rock, Arkansas

Dr. Day practices at UAMS Medical Center in Little Rock, Arkansas, part of University of Arkansas for Medical Sciences.

Dr. Day's NPI, 1043310006, was assigned on September 22, 2006. Dr. Day graduated from University Of Washington School Of Medicine in 1989. Dr. Day's Texas license number on file is 41851.

NPI and contact details
Medicare PAC ID
4688667868
NPI enumeration date
September 22, 2006
NPI status
Active
Accepts Medicare assignment
Yes
Practice phone
(501) 686-5000
Professional email
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Personal email
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Mobile number
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Sex
Male
Estimated age
63
Medical school graduation
1989

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)

Dr. John D. Day practices at UAMS Medical Center in Little Rock, Arkansas

Dr. Day's primary practice is UAMS Medical Center, at 4301 West Markham Street Mail Slot 612, Little Rock, AR 72205 in Pulaski County. The practice phone is (501) 686-5000.

  • UAMS Medical Center
    4301 West Markham Street Mail Slot 612, Little Rock, AR 72205 · Pulaski CountyPhone(501) 686-5000

Source: Dmand AI Affiliation Data

Dr. John D. Day is affiliated with 3 sites of care and 5 medical groups

Dr. Day's primary practice is UAMS Medical Center in Little Rock, Arkansas, part of University of Arkansas for Medical Sciences. Dr. Day is also affiliated with University Medical Center of El Paso. The medical group on file is UAMS - University of Arkansas for Medical Sciences. Dmand AI also links Dr. Day to 4 more medical groups and 1 group practice or clinic, each named with a free account.

See all 8 affiliations for Dr. Day

Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at Dr. John D. Day's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Day practices, 3 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
UAMS Medical CenterAvailable with a free account
+2 more sites and 4 medical groupsAvailable with a free account

Source: Dmand AI Technology Install Data

For health IT teams

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Dmand AI maps EHR vendors, IT decision makers and buying committees across University of Arkansas for Medical Sciences and 6.2K+ hospitals, with verified contacts in the same login.

Dr. John D. Day is one of 76 neurosurgeons in Arkansas

Neurological surgery is Dr. Day's primary specialty in the NPI Registry, under taxonomy code 207T00000X. Dr. Day is board certified in neurological surgery by the American Board of Neurological Surgery. Dmand AI has Dr. Day's licenses on file in 6 states: Texas, California, Arkansas, Colorado, Pennsylvania and Ohio.

Specialties and state licenses

  • Neurological surgery, TexasPrimaryLicense 41851 · 2007 to 2025 · taxonomy 207T00000X
  • California licenseSince 1991
  • Arkansas license2010 to 2025
  • Colorado license2004 to 2011
  • Pennsylvania license1996 to 2004
  • Ohio license1996 to 1998

Clinical focus

Dmand AI lists craniotomy among the conditions Dr. Day treats.

Neurosurgeons near Dr. Day

Counts of neurosurgeons with a Dmand AI profile, by place and practice. Each opens the list.

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Dr. John D. Day billed Medicare for 16 services in 2024

CMS data shows 16 Medicare services from Dr. Day across 1 procedure code in 2024, all of them office visits, for 32 Medicare patients. Medicare paid $1,273 for them. Every service was in an office.

Medicare services, 202416
Medicare patients32
Paid by Medicare$1,273
Procedure codes1

Dr. Day's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 432024: 1663%

Dr. Day compared with the Arkansas median for neurosurgeons, 2024

  • Dr. Day
  • Arkansas median
Medicare services
16vs 29094% below
Medicare patients
32vs 16480% below
Part D claims
54vs 12757% below

Medians across 72 neurosurgeons in Arkansas with Dmand AI profiles that report each measure.

Dr. Day's most billed Medicare procedure codes, 2024

CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.

See all procedures by Dr. Day

Need commercial claims for Dr. Day?

Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Day and other neurosurgeons in Arkansas.

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Dr. John D. Day treated 32 Medicare patients in 2024, average age 72

CMS counts 32 Medicare patients who saw Dr. Day in 2024. The largest group is 65 to 74, with 17 patients. 75% of them have arthritis, and 75% have high blood pressure. Their average risk score is 1.53, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Day's median patient age at 67, with 56% women.

Medicare patients, 202432
Average age72
Average risk score1.53

Dr. Day's Medicare patients by age, 2024

CMS leaves out age groups with fewer than 11 patients.

Dr. Day's Medicare patients by sex, 2024

  • Women1444%
  • Men1856%

Chronic conditions among Dr. Day's Medicare patients, 2024

  1. Arthritis75%
  2. High blood pressure75%
  3. High cholesterol75%

Share of Medicare patients with each condition. A patient can have several.

Dr. Day's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 67

Patient panel by sex, all payers

  • Women56%
  • Men43%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Dr. John D. Day wrote 109 Medicare Part D claims in 2024

In 2024, Dr. Day wrote 109 Medicare Part D claims for 46 patients. 97% of them were for generic drugs. CMS names the drug for 54 of them, across 3 drugs with 11 or more claims each, at $497 in total drug cost. In 2023, CMS named 13 claims across 1 drug.

Part D claims, 2024109
Drugs named by CMS3
Total drug cost$497
Part D patients46

Dr. Day's Part D claims by kind of drug, 2024

  • Generic106 claims97%
  • Brand-name and other3 claims3%

Dr. Day's most prescribed drugs by claims, 2024

CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.

Drug classes CMS tracks in Dr. Day's Part D claims, 2024

  • Opioids22%24 of 109 claims

Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.

Part D claims for drugs CMS names, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 132024: 54315%

Drugs named by CMS: 3 in 2024, 1 in 2023.

See all prescribing by Dr. Day

Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data

Dr. John D. Day ranks in the 34th percentile for spinal fusion in Medicare

Dr. Day accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 17 procedures of spinal fusion by Dr. Day, more than 34% of the clinicians it reports for that procedure.

Accepts Medicare assignment
Yes

Where Dr. Day ranks in Medicare procedure volume

Spinal fusion
34th percentile17 procedures

CMS ranks each clinician against every clinician it reports for the same procedure category.

Laminectomy or laminotomy (partial removal of spine bones): 1 to 10 procedures (CMS shows small counts as a range)

Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)

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Dr. John D. Day has 6 publications on record

Dmand AI links 6 papers to Dr. Day in 2022. 2022 was the busiest year, with 4. The most frequent topics are Skull Base and Tomography, X-Ray Computed. Dr. Day's most frequent co-authors are Robert C. Rennert, MD, Alexander A. Khalessi, MD, MS and Michael Lee Levy, MD.

Papers6

Topics Dr. Day writes about most

  • Skull Base
  • Tomography, X-Ray Computed

Dr. Day's most frequent co-authors

Recent publications by Dr. Day

See all 6 publications and co-authors

See who Dr. Day researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Day works with, so you can find a warm path to the right neurosurgeons.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

Dr. John D. Day received $58,447 in industry payments from 2016 to 2025

CMS Open Payments shows 65 general payments to Dr. Day from 18 drug and device companies from 2016 to 2025. Royalties and licenses make up the largest share, 90% of the total. Mizuho America, Inc. paid the most, $53,469.

General payments to Dr. Day by program year, 2016 to 2025

General payments to Dr. Day by kind, 2016 to 2025

$58.4Kin total
  • Royalties and licenses$52,87290%
  • Food and beverage$2,9715%
  • Travel and lodging$2,6044%

Companies that paid Dr. Day the most, 2016 to 2025

Share is of all general payments to this clinician.

See all payments to Dr. Day

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Dr. John D. Day has 1 award and honors on record

Dmand AI lists 1 award for Dr. Day, most recently CMS Stage 1 EHR in 2014.

Awards and honors for Dr. Day

  1. 2014
    • CMS Stage 1 EHR

Source: Dmand AI Professional Profile Data

Dr. John D. Day graduated from University Of Washington School Of Medicine

Dr. Day graduated from University Of Washington School Of Medicine in 1989. Dr. Day is a member of AANS and CNS.

  1. Medical schoolUniversity Of Washington School Of Medicine
  2. Board certified in neurological surgeryAmerican Board of Neurological Surgery

Source: Dmand AI Professional Profile Data

Dr. John D. Day accepts plans from 24 insurance carriers

Dr. Day is in network with 24 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Cigna. HMO plans come from the most carriers, 14. Check the plan with the practice before a visit.

Plan types Dr. Day accepts, by number of carriers

  1. HMO14
  2. PPO14
  3. Medicare10
  4. POS6
  5. EPO4
  6. Medicaid1

Source: Dmand AI Insurance Network Data

Sources for Dr. John D. Day's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneDmand AI Affiliation Data
Primary practice, affiliations and health systemDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Awards and committee rolesDmand AI Professional Profile Data
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Dr. John D. Day

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

What is Dr. John D. Day's NPI number?

Dr. John D. Day's NPI number is 1043310006. It was assigned on September 22, 2006, and it is active in the NPI Registry.

What kind of doctor is Dr. John D. Day?

Dr. John D. Day is a neurosurgeon in Little Rock, Arkansas. The primary specialty in the NPI Registry is Neurological Surgery Physician (taxonomy code 207T00000X).

Where does Dr. John D. Day practice?

Dr. Day practices at 4301 West Markham Street Mail Slot 612, Little Rock, AR 72205. Dr. Day's primary practice is UAMS Medical Center in Little Rock, Arkansas, part of University of Arkansas for Medical Sciences. Dmand AI also links Dr. Day to 4 medical groups and 1 group practice or clinic.

What is Dr. John D. Day's office phone number?

The practice phone on file for Dr. Day is (501) 686-5000.

What is Dr. John D. Day's medical license number?

Dr. Day's Texas license number on file is 41851, one of the licenses on file in 6 states.

Which states has Dr. John D. Day been licensed in?

Dmand AI has state licenses on file for Dr. Day in Texas (2007 to 2025), California (since 1991), Arkansas (2010 to 2025), Colorado (2004 to 2011), Pennsylvania (1996 to 2004) and Ohio (1996 to 1998).

Which hospitals is Dr. John D. Day affiliated with?

Dr. Day practices at UAMS Medical Center in Little Rock, Arkansas. Dr. Day is also affiliated with University Medical Center of El Paso.

What medical group is Dr. John D. Day part of?

Dr. Day is linked to UAMS - University of Arkansas for Medical Sciences. Dmand AI links Dr. Day to 4 more medical groups.

Does Dr. John D. Day accept Medicare?

Yes. CMS data shows Dr. Day billed Medicare for 16 services in 2024, and Dr. Day accepts Medicare assignment.

How many Medicare patients does Dr. John D. Day see?

CMS counts 32 Medicare patients who saw Dr. Day in 2024, with an average age of 72.

Show 9 more questionsShow fewer questions

Is Dr. John D. Day board certified?

Yes. Dr. Day is board certified in neurological surgery by the American Board of Neurological Surgery.

What services does Dr. John D. Day bill to Medicare?

In 2024, Dr. Day's most billed Medicare services were office visit, new patient (99203).

Where did Dr. John D. Day go to medical school?

Dr. Day graduated from University Of Washington School Of Medicine in 1989.

What drugs does Dr. John D. Day prescribe most?

In 2024 Medicare Part D data, Dr. Day's most prescribed drugs by claims were Methocarbamol, Meloxicam and Oxycodone-Acetaminophen.

Has Dr. John D. Day received payments from drug or device companies?

CMS Open Payments shows $58,447 in general payments to Dr. Day from 18 companies from 2016 to 2025. The largest total came from Mizuho America, Inc.

How long has Dr. John D. Day been practicing?

Dr. Day graduated from medical school in 1989, 37 years ago.

Does Dr. John D. Day do research?

Dmand AI links 6 publications to Dr. Day.

Who does Dr. John D. Day publish with?

Dr. Day's most frequent co-authors are Robert C. Rennert, MD (4 shared papers), Alexander A. Khalessi, MD, MS (3 shared papers) and Michael Lee Levy, MD (3 shared papers).

What insurance does Dr. John D. Day accept?

Dr. Day is in network with 24 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Cigna. HMO plans come from the most carriers, 14. Check the plan with the practice before a visit.

Selling to neurological surgery practices?

See neurosurgeons in Arkansas by site of care and group

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