Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Daniel R Lemay, MD, PHD

Individual provider Neurological Surgery Physician · NPI 1356347959

Daniel R Lemay, MD, PHD practises Neurosurgery in Downey, California. Graduated from University of Michigan Medical School in 1990, 36 years ago. Practices with Daniel R. Lemay MD PHD Inc, a 2-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
36
Trained at
University of Michigan Medical School
Licensed in
CA
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

8043 2nd St Ste 105
Downey, CA 90241-3621 Not confirmed with CMS for 12 years — call before visiting
Phone: (562) 862-1134
Fax: (562) 861-9895
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Neurological Surgery Physician (primary) Taxonomy 207T00000X · Licence G74285 (CA)

Record details

NPI number1356347959
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , PHD
Sole proprietorNo
NPI enumeratedJune 28, 2005
Last updated in NPPESJune 9, 2014

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNEUROSURGERY
Medical schoolUNIVERSITY OF MICHIGAN MEDICAL SCHOOL
Graduated 1990 (36 years in practice)
Group practice Daniel R. Lemay Md Phd Inc — 2 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Laminectomy or laminotomy (partial removal of spine bones) 25 times · 55th percentile
Spinal fusion 24 times · 40th percentile
Removal of tissue 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients192
Services billed 327 a service is one billed item, such as a visit, a test or a procedure
Average patient age71

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Daniel R. Lemay MD PHD Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Downey