What is Ann Callahan's NPI number?

Ann Callahan's National Provider Identifier (NPI) is 1144343328, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Ann Callahan's specialty?

Ann Callahan is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).

Where is Ann Callahan located?

Ann Callahan's practice location on file with NPPES is 10 Corbin Dr, Darien, CT 06820-5403.

What is Ann Callahan's phone number?

The practice phone number listed in the NPPES registry for Ann Callahan is (203) 655-0002.

Is Ann Callahan's NPI active?

Yes — Ann Callahan's NPI (1144343328) is active in the NPPES registry as of the last update on 2010-02-18.

IndividualActive

Ann Callahan, MD

NPI 1144343328 · Psychiatry Physician · Darien, CT

Ann Callahan, MD is a Psychiatry Physician provider in Darien, CT (NPI 1144343328).

Provider details

NPI number: 1144343328
Entity type: Individual
Primary specialty: Psychiatry PhysicianAllopathic & Osteopathic Physicians
Credential: MD
Sex: Female
Sole proprietor: No
License: 039508 (CT)

Practice location

10 Corbin Dr

Suite 4

Darien, CT 06820-5403

Phone: (203) 655-0002

Fax: (203) 655-0023

Street-level locationGet directions

More CT providers

Mailing address

10 Corbin Dr

Darien, CT 06820-5403

Specialties & taxonomies

Psychiatry PhysicianPrimary2084P0800XLicense 039508 (CT)
Allopathic & Osteopathic Physicians

Profile Score

Detailed profile(91/100 index)

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

Registry tenure33% of score
19 yrs in NPPES registry
Profile completeness33% of score
100% of core fields populated
Practice footprint20% of score
1 documented practice location
Open Payments transparency13% of score
Has Open Payments disclosures (2024)

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.

What this provider prescribes (Medicare Part D)

Top drugs by Medicare Part D claim volume, 2024 · 36 distinct drugs on file.

Drug	Part D claims (2024)	Beneficiaries
Venlafaxine Hclbrand: Venlafaxine Hcl Er	141	17
Fluoxetine Hcl	112	18
Duloxetine Hcl	95	17
Lorazepam	92	22
Clonazepam	91	13
Aripiprazole	89	17
Mirtazapine	85	14
Lamotrigine

Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do not include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.

Transparency — industry payments

Based on CMS Open Payments, 2024; not all care is captured.

$317 across 4 records (Open Payments 2024)

Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.

Enumerated: 2007-04-10
Last updated: 2010-02-18

Frequently asked questions

What is Ann Callahan's NPI number?: Ann Callahan's National Provider Identifier (NPI) is 1144343328, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Ann Callahan's specialty?: Ann Callahan is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
Where is Ann Callahan located?: Ann Callahan's practice location on file with NPPES is 10 Corbin Dr, Darien, CT 06820-5403.
What is Ann Callahan's phone number?: The practice phone number listed in the NPPES registry for Ann Callahan is (203) 655-0002.
Is Ann Callahan's NPI active?: Yes — Ann Callahan's NPI (1144343328) is active in the NPPES registry as of the last update on 2010-02-18.