Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Christopher G Ahnallen

Individual provider Clinical Psychologist · NPI 1558429563

Dr. Christopher G Ahnallen is a Clinical Psychologist in Boston, Massachusetts. Qualified in 2006, 20 years ago. Practices with Brigham and Womens Physicians Organization Inc, a 2,916-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
20
Licensed in
MA
In the registry since
2006
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Practice location Address checks out

1153 Centre St
Boston, MA 02130-3446 Not confirmed with CMS for 10 years — call before visiting
Phone: (617) 277-8107
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 9013 (MA)

Record details

NPI number1558429563
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedDecember 4, 2006
Last updated in NPPESJuly 14, 2016

Medicare enrollment

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

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 2006 (20 years in practice)
Group practice Brigham And Womens Physicians Organization Inc — 2916 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients47
Services billed 408 a service is one billed item, such as a visit, a test or a procedure
Average patient age56

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Brigham and Womens Physicians Organization Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2916 clinicians in the practice; 12 are shown here.

Other providers in Boston