Helen Lyall, RN, NP
NPI 1558925644 · Acute Care Nurse Practitioner · Tucson, AZ
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Helen Lyall, RN, NP is a Acute Care Nurse Practitioner provider in Tucson, AZ (NPI 1558925644).
Provider details
- NPI number
- 1558925644
- Entity type
- Individual
- Primary specialty
- Acute Care Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- RN, NP
- Sex
- Female
- Sole proprietor
- Yes
- License
- 108148 (AZ)
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
7 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
25 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) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 25 | $173 |
Typical Medicare-allowed amounts for these services range $173–$173 (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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2019-04-24
- Last updated
- 2021-09-16
- Certified
- 2021-09-16
Frequently asked questions
- What is Helen Lyall's NPI number?
- Helen Lyall's National Provider Identifier (NPI) is 1558925644, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Helen Lyall's specialty?
- Helen Lyall is listed in the NPPES registry with a primary specialty of Acute Care Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Helen Lyall located?
- Helen Lyall's practice location on file with NPPES is Tucson Medical Centre, Tucson, AZ 85712.
- What is Helen Lyall's phone number?
- The practice phone number listed in the NPPES registry for Helen Lyall is (520) 324-5695.
- Does Helen Lyall accept Medicare?
- Helen Lyall is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Helen Lyall's NPI active?
- Yes — Helen Lyall's NPI (1558925644) is active in the NPPES registry as of the last update on 2021-09-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.