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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Learn more about Dr. Catherine Gruer:

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Specialties & Research

  • She has special expertise in 1 area:
  • Alzheimer's Disease


Dr. Gruer has 5 hospital affiliations:

  • Lehigh Valley Hospital 
  • Chestnut Hill Hospital 

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Additional Information
Dr. Catherine Mary Gruer MD is a female Internist and practices in Geriatric Medicine.
Where does Dr. Catherine M. Gruer practice?
Dr. Catherine Gruer has 1 office location.
Dr. Catherine Gruer practices Geriatric Medicine near Allentown, PA.
See Allentown Geriatric Doctors.