Provider Profile
Geraldine Callahan, NP
Unclaimed ProfileAbout Geraldine Callahan
Geraldine Callahan, NP is a nurse practitioner based in Nashua, NH. Geraldine is also listed as specializing in nurse practitioner — psychiatric/mental health. Medicare claims data shows Geraldine provided 156 services to 41 patients. The services billed most often include established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more and established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (603) 889-8648
- Email not available
Practice Locations
39 SIMON ST STE 5
Nashua, NH 03060
Procedures Most Often Billed to Medicare
156 services · 41 patients · 2 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
115 | More often than most peers in Nurse Practitioner |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
41 | Less often than most peers in Nurse Practitioner |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Related specialists at this location 5
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other nurse practitioners in Nashua 8
Same specialty, same city.
More connections — 16 related providers in 2 groups
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 1991 at Other 8
Providers who graduated from the same medical school in the same year.
Common questions
What does Geraldine Callahan specialize in?
Geraldine Callahan is a nurse practitioner in Nashua, NH. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where is Geraldine Callahan located?
Geraldine Callahan is listed at 39 Simon St Ste 5, Nashua, NH 03060. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Geraldine Callahan's phone number?
The number on file is (603) 889-8648. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Geraldine Callahan?
Geraldine Callahan's National Provider Identifier is 1669865473. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Geraldine Callahan train?
Geraldine Callahan attended Other, graduating in 1991. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Geraldine Callahan have?
Geraldine Callahan has 35 years experience. Calculated from a graduation year of 1991, reported in the CMS National Downloadable File.
CMS public data
What does Geraldine Callahan do most often?
According to Medicare billing data, Geraldine Callahan the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Geraldine Callahan's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Geraldine Callahan. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.