What is Sidney Rehn's NPI number?

Sidney Rehn's National Provider Identifier (NPI) is 1023756616, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Sidney Rehn's specialty?

Sidney Rehn is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).

Where is Sidney Rehn located?

Sidney Rehn's practice location on file with NPPES is 75 Francis St, Boston, MA 02115-6110.

What is Sidney Rehn's phone number?

The practice phone number listed in the NPPES registry for Sidney Rehn is (617) 732-5500.

Is Sidney Rehn's NPI active?

Yes — Sidney Rehn's NPI (1023756616) is active in the NPPES registry as of the last update on 2026-03-28.

IndividualActive

Sidney Rehn, MD

NPI 1023756616 · Pediatrics Physician · Boston, MA

Sidney Rehn, MD is a Pediatrics Physician provider in Boston, MA (NPI 1023756616).

Provider details

NPI number: 1023756616
Entity type: Individual
Primary specialty: Pediatrics PhysicianAllopathic & Osteopathic Physicians
Credential: MD
Sex: Female
Sole proprietor: No
License: 1022467 (MA)

Specialties & taxonomies

Pediatrics PhysicianPrimary208000000XLicense 1022467 (MA)
Allopathic & Osteopathic Physicians

Profile Score

Established profile(60/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
4 yrs in NPPES registry
Profile completeness38% of score
100% of core fields populated
Practice footprint23% of score
1 documented practice location

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Practice location

75 Francis St

Boston, MA 02115-6110

Phone: (617) 732-5500

Street-level locationGet directions

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Mailing address