What is John Loewenstein's NPI number?

John Loewenstein's National Provider Identifier (NPI) is 1912997099, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is John Loewenstein's specialty?

John Loewenstein is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).

Where is John Loewenstein located?

John Loewenstein's practice location on file with NPPES is 243 Charles St, Boston, MA 02114-3002.

What is John Loewenstein's phone number?

The practice phone number listed in the NPPES registry for John Loewenstein is (617) 573-4458.

Is John Loewenstein's NPI active?

Yes — John Loewenstein's NPI (1912997099) is active in the NPPES registry as of the last update on 2013-08-22.

IndividualActive

John Loewenstein, M.D.

NPI 1912997099 · Ophthalmology Physician · Boston, MA

John Loewenstein, M.D. is a Ophthalmology Physician provider in Boston, MA (NPI 1912997099).

Provider details

NPI number: 1912997099
Entity type: Individual
Primary specialty: Ophthalmology PhysicianAllopathic & Osteopathic Physicians
Credential: M.D.
Sex: Male
Sole proprietor: No
License: 37447 (MA)

Specialties & taxonomies

Ophthalmology PhysicianPrimary207W00000XLicense 37447 (MA)
Allopathic & Osteopathic Physicians

Profile Score

Detailed profile(91/100 index)

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

Registry tenure38% of score
20 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

243 Charles St

Boston, MA 02114-3002

Phone: (617) 573-4458

Street-level locationGet directions

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Mailing address