Am J Physiol
Dr. Daniel R. Lemay, MD, PhD
- 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
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Daniel R. Lemay, MD, PHD, Inc
Downey, California
Find Dr. Lemay's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
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
- 1356347959NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7012924608
- NPI enumeration date
- June 28, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (562) 862-1134
- Professional email
- Get email
- Personal email
- Get email
- 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, Inc8043 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.
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.
| Site | EHR vendor and product |
|---|---|
| Daniel R. Lemay, MD, PHD, Inc | Available with a free account |
| +6 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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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, CaliforniaPrimary
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.
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.
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.
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.
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.
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
- High blood pressure75%
- High cholesterol75%
- Arthritis60%
- Diabetes47%
- Stroke or TIA35%
- Mood disorders32%
- Ischemic heart disease30%
- 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.
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.
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.
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
Surg Neurol
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.
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
- 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.
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.
- Medical school
- Board certified in 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.
- Aetna
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Elevance
- HCSC
- LA Care
- Blue Cross Blue Shield of Massachusetts
- Molina
- +9 more carriersWith a free account
Plan types Dr. Lemay accepts, by number of carriers
- HMO9
- Medicare9
- PPO9
- EPO4
- POS4
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Daniel R. Lemay's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare 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 percentiles | Doctors 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-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand 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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