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BAY WEST ENDOCRINOLOGY ASSOCIATES
NPI 1093918328
Specialist in Timonium, MD

Active since June 06, 2007CLIA 21D0680113 · Waiver
1 TEXAS STATION CT, TIMONIUM, MD 21093(410) 828-7417(410) 828-4695 Get Directions Write a Review

NPPES record last updated: May 9, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: May 9, 2025, Aug 22, 2020 (2 updates tracked since 2020).

About Bay West Endocrinology Associates NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

BAY WEST ENDOCRINOLOGY ASSOCIATES (NPI 1093918328), doing business as James H Mersey Mdpa, is a healthcare organization registered as a specialist in Timonium, Maryland and active in the NPI registry since June 2007. The organization holds a CLIA Waiver certificate valid through December 2, 2027 and lists Jennifer Marie Bauerlein, Practice Manager, as its authorized official.

NPPES Registry Identity

NPI1093918328
Entity TypeOrganization
Primary Taxonomy174400000X
Legal Business NameBAY WEST ENDOCRINOLOGY ASSOCIATES
Location Address1 TEXAS STATION CTTimonium, MD 21093-8286
Mailing Address1 Texas Station Ct, Suite 300Timonium, MD 21093-8286 · (410) 828-7417 · Fax (410) 828-4695
Phone(410) 828-7417
Fax(410) 828-4695
Organization SubpartNo
Authorized OfficialJennifer Marie BauerleinPractice Manager · (410) 828-7417
Enumeration DateJune 6, 2007
Last NPPES UpdateMay 9, 20252 updates tracked since enumeration
✔ NPI 1093918328 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers
Taxonomy Code174400000X
License✔ Licensed in MD · D19323
Definition
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
1 TEXAS STATION CT, Timonium, MD 21093
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Other Names 1

Doing Business AsJames H Mersey Mdpa

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X MULTIPLE SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Bay West Endocrinology Associates is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

11

Medicare enrollment records show 11 clinicians reassign Medicare billing to Bay West Endocrinology Associates, which bills Medicare for the services they deliver. Of these, 7 practice at this address and 11 within 10 miles. They are listed nearest first.

Clinicians by Medicare Specialty 2

Endocrinology10
Nurse Practitioner1

Clinicians, nearest first (11)

Ashley Davidson, MD
Endocrinology
NPI 1457481947
1 TEXAS STATION CT
Timonium, MD 21093
(410) 828-7417
✔ PECOS✔ Accepts MedicareSame address
Ruth Horowitz, MD
Endocrinology
NPI 1003811423
1 TEXAS STATION CT
Timonium, MD 21093
(410) 828-7417
✔ PECOS✔ Accepts MedicareSame address
Meena Khan, MD
Endocrinology
NPI 1831200203
1 TEXAS STATION CT
Timonium, MD 21093
(410) 828-7417
✔ PECOS✔ Accepts MedicareSame address
Jeffrey Mindel, MD
Endocrinology
NPI 1821133091
1 TEXAS STATION CT
Timonium, MD 21093
(410) 828-7417
✔ PECOS✔ Accepts MedicareSame address
Vivian Pao, MD
Endocrinology
NPI 1265604870
1 TEXAS STATION CT SUITE 300
Timonium, MD 21093
(410) 828-7417
✔ PECOS✔ Accepts MedicareSame address
Hui Peng, MD
Endocrinology
NPI 1518271071
1 TEXAS STATION CT
Timonium, MD 21093
(410) 828-7417
✔ PECOS✔ Accepts MedicareSame address
Joanna Tyzack, MD
Endocrinology
NPI 1487659892
1 TEXAS STATION CT SUITE 300
Timonium, MD 21093
(410) 828-7417
✔ PECOS✔ Accepts MedicareSame address
Craig Haber, MD
Endocrinology
NPI 1255336673
1 TEXAS STATION CT SUITE 300
Timonium, MD 21093
(410) 828-7417
✔ PECOS✔ Accepts Medicare1.2 mi
Hyoen Lee, NP
Nurse Practitioner
NPI 1871859926
1 TEXAS STATION CT
Timonium, MD 21093
(410) 828-7417
✔ PECOS✔ Accepts Medicare1.8 mi
Philip Levin, M.D.
Endocrinology
NPI 1528063567
6535 NORTH CHARLES STREET SUITE 400
Baltimore, MD 21204
(410) 828-7417
✔ PECOS✔ Accepts Medicare3.2 mi
Francis Lee, M.D.
Endocrinology
NPI 1861497828
6535 N CHARLES ST STE 400
Baltimore, MD 21204
(410) 828-7417
✔ PECOS3.2 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 21D0680113

Bay West Endocrinology Associates · Timonium, MD
Active · expires Dec 2, 2027
CLIA Number21D0680113
Laboratory TypePhysician Office
Certificate Effective DateDecember 3, 2025
Certificate Expiration DateDecember 2, 2027
Laboratory DirectorJeffrey Mindel
Laboratory Phone(410) 828-7417
Laboratory LocationBay West Endocrinology AssociatesOne Texas Station Court Suite 300, Timonium, MD 21093
CLIA data matches this NPI record on: Name Phone
This certificate is issued to a laboratory to perform only waived tests.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Bay West Endocrinology Associates's NPI number?

The NPI number for Bay West Endocrinology Associates is 1093918328. It was assigned to this organization in the NPPES registry on June 6, 2007. The provider is doing business as James H Mersey MDPA.

Where is Bay West Endocrinology Associates located?

Bay West Endocrinology Associates is located at 1 Texas Station Ct, Timonium, MD 21093. The listed phone number is (410) 828-7417.

What is Bay West Endocrinology Associates's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Is Bay West Endocrinology Associates enrolled in Medicare?

Yes. Bay West Endocrinology Associates is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Bay West Endocrinology Associates?

According to the CMS Revalidation Reassignment List (October 2026 release), 11 clinicians in 2 Medicare specialties reassign their Medicare billing to Bay West Endocrinology Associates. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. The largest specialties are Endocrinology (10) and Nurse Practitioner (1). Of these, 7 practice at this address and 11 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Bay West Endocrinology Associates hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 21D0680113) is associated with this NPI, valid through December 2, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Bay West Endocrinology Associates was last updated on May 9, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.