What is Calvin Ludwig's NPI number?

Calvin Ludwig's National Provider Identifier (NPI) is 1407541485, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Calvin Ludwig's specialty?

Calvin Ludwig is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).

Where is Calvin Ludwig located?

Calvin Ludwig's practice location on file with NPPES is 800 Washington St, Boston, MA 02111-1552.

What is Calvin Ludwig's phone number?

The practice phone number listed in the NPPES registry for Calvin Ludwig is (617) 636-5000.

Is Calvin Ludwig's NPI active?

Yes — Calvin Ludwig's NPI (1407541485) is active in the NPPES registry as of the last update on 2023-06-06.

IndividualActive

Calvin Ludwig, MD

NPI 1407541485 · Internal Medicine Physician · Boston, MA

Calvin Ludwig, MD is a Internal Medicine Physician provider in Boston, MA (NPI 1407541485).

Provider details

NPI number: 1407541485
Entity type: Individual
Primary specialty: Internal Medicine PhysicianAllopathic & Osteopathic Physicians
Credential: MD
Sex: Male
Sole proprietor: No
License: 3013982 (MA)

Specialties & taxonomies

Internal Medicine PhysicianPrimary207R00000XLicense 3013982 (MA)
Allopathic & Osteopathic Physicians

Profile Score

Established profile(58/100 index)

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

Registry tenure38% of score
3 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

800 Washington St

Boston, MA 02111-1552

Phone: (617) 636-5000

Street-level locationGet directions

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Mailing address