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Mary Mahler, MD
NPI 1326703927 · Medical Oncology Physician · Philadelphia, PA
Mary Mahler, MD is a Medical Oncology Physician provider in Philadelphia, PA (NPI 1326703927).
Provider details
- NPI number
- 1326703927
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- MD475737 (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Established profile(61/100 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
51 N 39th St
Philadelphia, PA 19104-2640
Phone: (215) 662-9801
Street-level locationGet directions
Mailing address
1639 Addison St
Philadelphia, PA 19146-1504
Registry dates
- Enumerated
- 2021-11-08
- Last updated
- 2021-11-08
- Certified
- 2021-11-08
Frequently asked questions
- What is Mary Mahler's NPI number?
- Mary Mahler's National Provider Identifier (NPI) is 1326703927, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Mahler's specialty?
- Mary Mahler is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Mahler located?
- Mary Mahler's practice location on file with NPPES is 51 N 39th St, Philadelphia, PA 19104-2640.
- What is Mary Mahler's phone number?
- The practice phone number listed in the NPPES registry for Mary Mahler is (215) 662-9801.
- Is Mary Mahler's NPI active?
- Yes — Mary Mahler's NPI (1326703927) is active in the NPPES registry as of the last update on 2021-11-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.