Helen Callahan, CRNP
NPI 1215937883 · Nurse Practitioner · Tucson, AZ
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Helen Callahan, CRNP is a Nurse Practitioner provider in Tucson, AZ (NPI 1215937883).
Provider details
- NPI number
- 1215937883
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- CRNP
- Sex
- Female
- Sole proprietor
- No
- License
- SP008353 (PA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
16 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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 does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 16 | $9 |
Typical Medicare-allowed amounts for these services range $9–$9 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 53 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 129 | 63 |
| Levothyroxine Sodium | 115 | 67 |
| Amlodipine Besylate | 110 | 46 |
| Lisinopril | 93 | 44 |
| Metformin Hcl | 85 | 40 |
| Omeprazole | 63 | 30 |
| Losartan Potassium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-07-26
- Last updated
- 2016-10-25
Frequently asked questions
- What is Helen Callahan's NPI number?
- Helen Callahan's National Provider Identifier (NPI) is 1215937883, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Helen Callahan's specialty?
- Helen Callahan is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Helen Callahan located?
- Helen Callahan's practice location on file with NPPES is 4892 N Stone Ave Ste 100, Tucson, AZ 85704-5761.
- What is Helen Callahan's phone number?
- The practice phone number listed in the NPPES registry for Helen Callahan is (520) 396-1360.
- Does Helen Callahan accept Medicare?
- Helen Callahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Helen Callahan's NPI active?
- Yes — Helen Callahan's NPI (1215937883) is active in the NPPES registry as of the last update on 2016-10-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.