Dr. Daniel R. Lemay, MD, PhD

  • Downey, CA
  • Neurosurgeon
NPI1356347959PAC ID7012924608
Medicare services, 2024
251
Medicare patients, 2024
192
Part D claims, 2024
32
Publications
7
Hospital affiliations
4
Practice address
8043 2nd St, Downey, CA 90241
Practice phone
Call (562) 862-1134
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

Daniel R. Lemay, MD, PHD, Inc

Downey, California

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Dr. Daniel R. Lemay is a neurosurgeon in Downey, California

Dr. Lemay practices at Daniel R. Lemay, MD, PHD, Inc in Downey, California.

Dr. Lemay's NPI, 1356347959, was assigned on June 28, 2005. Dr. Lemay graduated from University Of Michigan Medical School in 1990. Dr. Lemay holds California license G74285.

NPI and contact details
Medicare PAC ID
7012924608
NPI enumeration date
June 28, 2005
NPI status
Active
Accepts Medicare assignment
Yes
Practice phone
(562) 862-1134
Professional email
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Personal email
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Mobile number
Get number
Sex
Male
Estimated age
62
Medical school graduation
1990

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

Dr. Daniel R. Lemay practices at Daniel R. Lemay, MD, PHD, Inc in Downey, California

Dr. Lemay's primary practice is Daniel R. Lemay, MD, PHD, Inc, at 8043 2nd St, Downey, CA 90241 in Los Angeles County. The practice phone is (562) 862-1134.

  • Daniel R. Lemay, MD, PHD, Inc
    8043 2nd St, Downey, CA 90241 · Los Angeles CountyPhone(562) 862-1134

Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data

Dr. Daniel R. Lemay is affiliated with 7 sites of care and 2 medical groups

Dr. Lemay's primary practice is Daniel R. Lemay, MD, PHD, Inc in Downey, California. Dr. Lemay is also affiliated with Dignity Health - St. Mary Medical Center. The medical group on file is Neuro Wellness Group. Dmand AI also links Dr. Lemay to 3 more hospitals, 2 group practices and clinics and 1 medical group, each named with a free account.

See all 9 affiliations for Dr. Lemay

Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data

Dmand AI tracks the EHR system at Dr. Daniel R. Lemay's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Lemay practices, 6 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Daniel R. Lemay, MD, PHD, IncAvailable with a free account
+6 more sites and 1 medical groupAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. Daniel R. Lemay is one of 846 neurosurgeons in California

Neurological surgery is Dr. Lemay's primary specialty in the NPI Registry, under taxonomy code 207T00000X. Dr. Lemay is board certified in neurological surgery by the American Board of Neurological Surgery. Dr. Lemay is licensed in California.

Specialties and state licenses

  • Neurological surgery, CaliforniaPrimaryLicense G74285 · 1992 to 2026 · taxonomy 207T00000X

Clinical focus

Dmand AI lists back and neck pain treatment without fusion, craniotomy, lower back pain, muscle pain, fibromyalgia, and limb pain, neck pain and spine problems and thoracic spine disorders among the conditions Dr. Lemay treats.

Neurosurgeons near Dr. Lemay

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

846neurosurgeons in California
4neurosurgeons in Downey

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

Dr. Daniel R. Lemay billed Medicare for 251 services in 2024

CMS data shows 251 Medicare services from Dr. Lemay across 8 procedure codes in 2024, for 192 Medicare patients. Medicare paid $22,966 for them.

Medicare services, 2024251
Medicare patients192
Paid by Medicare$22,966
Procedure codes8

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

  • 2023
  • 2024
Office and hospital visits
2023: 3372024: 25126%
Surgery
2023: 132024: 0100%

Where Dr. Lemay's Medicare services took place, 2024

  • In an office13654%
  • In a facility11546%

Dr. Lemay compared with the California median for neurosurgeons, 2024

  • Dr. Lemay
  • California median
Medicare services
251vs 21616% above
Medicare patients
192vs 15425% above
Part D claims
14vs 2646% below

Medians across 679 neurosurgeons in California with Dmand AI profiles that report each measure.

Dr. Lemay'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. Lemay

Need commercial claims for Dr. Lemay?

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

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

Dr. Daniel R. Lemay treated 192 Medicare patients in 2024, average age 71

CMS counts 192 Medicare patients who saw Dr. Lemay in 2024. The largest group is 65 to 74, with 70 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 74% are also on Medicaid. Their average risk score is 1.71, 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. Lemay's median patient age at 60, with 53% women.

Medicare patients, 2024192
Average age71
Average risk score1.71
Also on Medicaid74%

Dr. Lemay's Medicare patients by age, 2024

Dr. Lemay's Medicare patients by sex, 2024

  • Women11158%
  • Men8142%

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

  1. High blood pressure75%
  2. High cholesterol75%
  3. Arthritis60%
  4. Diabetes47%
  5. Stroke or TIA35%
  6. Mood disorders32%
  7. Ischemic heart disease30%
  8. Depression29%

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

Dr. Lemay's patients across all payers

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

Patient panel by age, all payers

Median age 60

Patient panel by sex, all payers

  • Women53%
  • Men46%

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

Dr. Daniel R. Lemay wrote 32 Medicare Part D claims in 2024

In 2024, Dr. Lemay wrote 32 Medicare Part D claims for 16 patients. 97% of them were for generic drugs. CMS names the drug for 14 of them, across 1 drug with 11 or more claims each, at $64 in total drug cost. In 2020, CMS named 11 claims across 1 drug.

Part D claims, 202432
Drugs named by CMS1
Total drug cost$64
Part D patients16

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

  • Generic31 claims97%
  • Brand-name and other1 claims3%

Dr. Lemay'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.

Part D claims for drugs CMS names, 2020 to 2024

  • 2020
  • 2024
Claims for drugs CMS names
2020: 112024: 1427%

Drugs named by CMS: 1 in 2024, 1 in 2020.

See all prescribing by Dr. Lemay

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. Daniel R. Lemay ranks in the 51st percentile for laminectomy or laminotomy (partial removal of spine bones) in Medicare

Dr. Lemay accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 22 procedures of laminectomy or laminotomy (partial removal of spine bones) by Dr. Lemay, more than 51% of the clinicians it reports for that procedure.

Accepts Medicare assignment
Yes

Where Dr. Lemay ranks in Medicare procedure volume

Laminectomy or laminotomy (partial removal of spine bones)
51st percentile22 procedures
Spinal fusion
30th percentile13 procedures

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

Removal of tissue: 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. Daniel R. Lemay has 7 publications on record

Dmand AI links 7 papers to Dr. Lemay. The most frequent topics are Rats, Inbred Strains, Blood Glucose and Paraplegia. Dr. Lemay has published most often in J Neurosurg.

Papers7

Topics Dr. Lemay writes about most

  • Rats, Inbred Strains
  • Blood Glucose
  • Paraplegia
  • Ischemia
  • Nervous System
  • Spinal Cord
  • Aorta
  • Brain Ischemia

Recent publications by Dr. Lemay

See all 7 publications and co-authors

See who Dr. Lemay researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Lemay 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. Daniel R. Lemay received $140 in industry payments from 2017 to 2021

CMS Open Payments shows 6 general payments to Dr. Lemay from 6 drug and device companies from 2017 to 2021. Food and beverage make up the largest share, 57% of the total. Integrity Implants Inc. paid the most, $60.

General payments to Dr. Lemay by program year, 2017 to 2021

General payments to Dr. Lemay by kind, 2017 to 2021

$140in total
  • Food and beverage$8057%
  • Gifts$6043%

Companies that paid Dr. Lemay the most, 2017 to 2021

Share is of all general payments to this clinician.

See all payments to Dr. Lemay

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

Dr. Daniel R. Lemay graduated from University Of Michigan Medical School

Dr. Lemay graduated from University Of Michigan Medical School in 1990.

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

Source: Dmand AI Professional Profile Data

Dr. Daniel R. Lemay accepts plans from 17 insurance carriers

Dr. Lemay is in network with 17 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. HMO plans come from the most carriers, 9. Check the plan with the practice before a visit.

Plan types Dr. Lemay accepts, by number of carriers

  1. HMO9
  2. Medicare9
  3. PPO9
  4. EPO4
  5. POS4
  6. Medicaid1

Source: Dmand AI Insurance Network Data

Sources for Dr. Daniel R. Lemay'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 phoneNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data
Primary practice, affiliations and health systemNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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)
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. Daniel R. Lemay

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. Daniel R. Lemay's NPI number?

Dr. Daniel R. Lemay's NPI number is 1356347959. It was assigned on June 28, 2005, and it is active in the NPI Registry.

What kind of doctor is Dr. Daniel R. Lemay?

Dr. Daniel R. Lemay is a neurosurgeon in Downey, California. The primary specialty in the NPI Registry is Neurological Surgery Physician (taxonomy code 207T00000X).

Where does Dr. Daniel R. Lemay practice?

Dr. Lemay practices at 8043 2nd St, Downey, CA 90241. Dr. Lemay's primary practice is Daniel R. Lemay, MD, PHD, Inc in Downey, California. Dmand AI also links Dr. Lemay to 3 hospitals, 2 group practices and clinics and 1 medical group.

What is Dr. Daniel R. Lemay's office phone number?

The practice phone on file for Dr. Lemay is (562) 862-1134.

What is Dr. Daniel R. Lemay's medical license number?

Dr. Lemay holds California license G74285.

Which hospitals is Dr. Daniel R. Lemay affiliated with?

Dr. Lemay is affiliated with Dignity Health - St. Mary Medical Center. Dmand AI links Dr. Lemay to 3 more hospitals.

What medical group is Dr. Daniel R. Lemay part of?

Dr. Lemay is linked to Neuro Wellness Group. Dmand AI links Dr. Lemay to 1 more medical group.

Does Dr. Daniel R. Lemay accept Medicare?

Yes. CMS data shows Dr. Lemay billed Medicare for 251 services in 2024, and Dr. Lemay accepts Medicare assignment.

How many Medicare patients does Dr. Daniel R. Lemay see?

CMS counts 192 Medicare patients who saw Dr. Lemay in 2024, with an average age of 71.

Is Dr. Daniel R. Lemay board certified?

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

Show 7 more questionsShow fewer questions

What services does Dr. Daniel R. Lemay bill to Medicare?

In 2024, Dr. Lemay's most billed Medicare services were office visit, established patient (99214), hospital inpatient care (99231) and hospital inpatient care (99222).

Where did Dr. Daniel R. Lemay go to medical school?

Dr. Lemay graduated from University Of Michigan Medical School in 1990.

What drugs does Dr. Daniel R. Lemay prescribe most?

In 2024 Medicare Part D data, Dr. Lemay's most prescribed drugs by claims were Cyclobenzaprine HCl.

Has Dr. Daniel R. Lemay received payments from drug or device companies?

CMS Open Payments shows $140 in general payments to Dr. Lemay from 6 companies from 2017 to 2021. The largest total came from Integrity Implants Inc.

How long has Dr. Daniel R. Lemay been practicing?

Dr. Lemay graduated from medical school in 1990, 36 years ago.

Does Dr. Daniel R. Lemay do research?

Dmand AI links 7 publications to Dr. Lemay.

What insurance does Dr. Daniel R. Lemay accept?

Dr. Lemay is in network with 17 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. HMO plans come from the most carriers, 9. Check the plan with the practice before a visit.

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