Question 1

What does Mary L. O'Brien specialize in?

Accepted Answer

Mary L. O'Brien is an advanced practice midwife in Hermosa Beach, CA. That is the designation recorded for this NPI in the federal registry.

Question 2

Where is Mary L. O'Brien located?

Accepted Answer

Mary L. O'Brien is listed at 1028 Loma Dr, Hermosa Beach, CA 90254. Addresses come from the NPI registry and can lag a move, so confirm before travelling.

Question 3

What is Mary L. O'Brien's phone number?

Accepted Answer

The number on file is (310) 376-5647. Guide.md cannot book appointments or pass on messages — please call the office directly.

Question 4

What is Mary L. O'Brien's NPI number?

Accepted Answer

Mary L. O'Brien's National Provider Identifier is 1124177332. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.

Question 5

How long has Mary L. O'Brien been practicing?

Accepted Answer

Mary L. O'Brien has 19+ years experience. Registered with an NPI since 2007. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.

NPI registry

Question 6

Has Mary L. O'Brien confirmed this information?

Accepted Answer

Not yet. This profile is built from public federal data and has not been confirmed by Mary L. O'Brien. If this is you, claiming it is free.

Mary L. O'Brien, CNM

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