Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Walter Matthew Ryan III, DO

Individual provider Allergy & Immunology Physician · NPI 1073503843

Dr. Walter Matthew Ryan III, DO is an Allergy/Immunology in Nashua, New Hampshire. Qualified in 1993, 33 years ago. Practices with Mary Hitchcock Memorial Hospital, a 1,266-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Florida and New Hampshire.

Years since qualifying
33
Licensed in
FL, NH
In the registry since
2005
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

2300 Southwood Dr
Nashua, NH 03063-1818
Phone: (603) 577-4000
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 350 Nw 84th Ave, Plantation, FL 33324-1817 — (954) 472-4848

Specialties & licences

Allergy & Immunology (Internal Medicine) Physician (primary) Taxonomy 207RA0201X · Licence 24463 (NH)
Allergy & Immunology Physician Taxonomy 207K00000X · Licence OS10177 (FL)

Record details

NPI number1073503843
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedOctober 24, 2005
Last updated in NPPESAugust 4, 2023
Certification dateJuly 19, 2023

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyALLERGY/IMMUNOLOGY
Medical schoolOTHER
Graduated 1993 (33 years in practice)
Group practice Mary Hitchcock Memorial Hospital — 1266 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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