Dr. Katy-Ann E. Hannigan, DO
- Hospital affiliations
- 1
- Industry payments
- $125
- Medical groups
- 3
- State license
- 1
- Year NPI issued
- 2005
- Practice address
- 242 Green Street, Gardner, MA 01440
- Practice phone
- Call (978) 632-3420
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Hannigan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Katy-Ann E. Hannigan is a pediatrician in Gardner, Massachusetts
Dr. Hannigan practices at Heywood Hospital in Gardner, Massachusetts, part of Heywood Healthcare.
Dr. Hannigan's NPI, 1558351635, was assigned on October 28, 2005. Dr. Hannigan holds Massachusetts license 219096.
- NPI
- 1558351635NPI Registry (opens in a new tab)
- NPI enumeration date
- October 28, 2005
- NPI status
- Active
- Practice phone
- (978) 632-3420
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 54
- Medical school graduation
- 1998
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Katy-Ann E. Hannigan practices at Heywood Hospital in Gardner, Massachusetts
Dr. Hannigan's primary practice is Heywood Hospital, at 242 Green Street, Gardner, MA 01440 in Worcester County. The practice phone is (978) 632-3420.
- Heywood Hospital242 Green Street, Gardner, MA 01440 · Worcester CountyPhone(978) 632-3420
Source: Dmand AI Affiliation Data
Dr. Katy-Ann E. Hannigan is affiliated with 3 sites of care and 3 medical groups
Dr. Hannigan's primary practice is Heywood Hospital in Gardner, Massachusetts, part of Heywood Healthcare. The medical group on file is Heywood Hospital. Dmand AI also links Dr. Hannigan to 2 more group practices and clinics and 2 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Katy-Ann E. Hannigan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hannigan practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Heywood Hospital | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Heywood Healthcare and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Katy-Ann E. Hannigan is one of 2,101 pediatricians in Massachusetts
Pediatrics is Dr. Hannigan's primary specialty in the NPI Registry, under taxonomy code 208000000X. Dr. Hannigan is licensed in Massachusetts.
Specialties and state licenses
- Pediatrics, MassachusettsPrimary
Pediatricians near Dr. Hannigan
Counts of pediatricians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Katy-Ann E. Hannigan's patients have a median age of 9
Across all payers, Dmand AI patient panel data puts Dr. Hannigan's median patient age at 9, with 50% women.
Dr. Hannigan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 9
Patient panel by sex, all payers
- Women50%
- Men50%
Source: Dmand AI Patient Panel Data
Dr. Katy-Ann E. Hannigan received $125 in industry payments from 2016 to 2025
CMS Open Payments shows 8 general payments to Dr. Hannigan from 4 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. GlaxoSmithKline, LLC. paid the most, $71.
General payments to Dr. Hannigan by program year, 2016 to 2025
Companies that paid Dr. Hannigan the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Katy-Ann E. Hannigan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Katy-Ann E. Hannigan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Katy-Ann E. Hannigan's NPI number?
Dr. Katy-Ann E. Hannigan's NPI number is 1558351635. It was assigned on October 28, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Katy-Ann E. Hannigan?
Dr. Katy-Ann E. Hannigan is a pediatrician in Gardner, Massachusetts. The primary specialty in the NPI Registry is Pediatrics Physician (taxonomy code 208000000X).
Where does Dr. Katy-Ann E. Hannigan practice?
Dr. Hannigan practices at 242 Green Street, Gardner, MA 01440. Dr. Hannigan's primary practice is Heywood Hospital in Gardner, Massachusetts, part of Heywood Healthcare. Dmand AI also links Dr. Hannigan to 2 group practices and clinics and 2 medical groups.
What is Dr. Katy-Ann E. Hannigan's office phone number?
The practice phone on file for Dr. Hannigan is (978) 632-3420.
What is Dr. Katy-Ann E. Hannigan's medical license number?
Dr. Hannigan holds Massachusetts license 219096.
Which hospitals is Dr. Katy-Ann E. Hannigan affiliated with?
Dr. Hannigan practices at Heywood Hospital in Gardner, Massachusetts.
What medical group is Dr. Katy-Ann E. Hannigan part of?
Dr. Hannigan is linked to Heywood Hospital. Dmand AI links Dr. Hannigan to 2 more medical groups.
Has Dr. Katy-Ann E. Hannigan received payments from drug or device companies?
CMS Open Payments shows $125 in general payments to Dr. Hannigan from 4 companies from 2016 to 2025. The largest total came from GlaxoSmithKline, LLC.
How long has Dr. Katy-Ann E. Hannigan been practicing?
Dr. Hannigan graduated from medical school in 1998, 28 years ago.
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