Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Michael Leopold Grynsztejn

Individual provider Anesthesiology Physician · NPI 1679623151

Michael Leopold Grynsztejn practises Anesthesiology in Houston, Texas. Qualified in 1981, 45 years ago. Practices with Lonestar Anesthesia Solutions PLLC, a 42-clinician group and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
45
Licensed in
TX
In the registry since
2007
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Practice location Address checks out

1500 Citywest Blvd Ste 300
Houston, TX 77042
Phone: (713) 620-4000
Fax: (713) 458-4229
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence H1097 (TX)

Record details

NPI number1679623151
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedJanuary 10, 2007
Last updated in NPPESJuly 14, 2020
Certification dateJuly 14, 2020

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolOTHER
Graduated 1981 (45 years in practice)
Group practice Lonestar Anesthesia Solutions Pllc — 42 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients66
Services billed 90 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.

Colleagues at Lonestar Anesthesia Solutions PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 42 clinicians in the practice; 12 are shown here.

Other providers in Houston