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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Steven Robert Bayer, M.D.

Reproductive Endocrinology Physician in Brookline, MA · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1154375038

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Registry record

Entity type Individual (Type 1)
Name Dr. Steven Robert Bayer
Credential M.D.
Sex Male
Practice address 1 Brookline Pl Ste 302, Boston Ivf - the Boston Center, Brookline, MA, 02445
Phone (617) 735-9000
Fax (617) 738-8993
Enumeration date May 22, 2006
Last updated in NPPES Jan 27, 2017

Taxonomy & licenses

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License 54954 (MA) Primary
207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License MD10619 (RI) Secondary
207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License 10741 (NH) Secondary
207VG0400X Gynecology Physician Allopathic & Osteopathic Physicians · License 54954 (MA) Secondary
207VG0400X Gynecology Physician Allopathic & Osteopathic Physicians · License MD10619 (RI) Secondary
207VG0400X Gynecology Physician Allopathic & Osteopathic Physicians · License 10741 (NH) Secondary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
6198538 Medicaid MA -

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

What specialty is Steven Bayer?
Steven Bayer is registered in NPPES with the primary taxonomy of Reproductive Endocrinology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-01-27.