Hollis Underwood, M.D.
NPI 1770640369 · Internal Medicine Physician · Phoenix, AZ
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Hollis Underwood, M.D. is a Internal Medicine Physician provider in Phoenix, AZ (NPI 1770640369).
Provider details
- NPI number
- 1770640369
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 22415 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 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
749 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 434 | $124 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 230 | $16 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 85 | $88 |
Typical Medicare-allowed amounts for these services range $16–$124 (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 · 135 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 668 | 213 |
| Rosuvastatin Calcium | 627 | 220 |
| Amlodipine Besylate | 609 | 181 |
| Levothyroxine Sodium | 452 | 132 |
| Pantoprazole Sodium | 342 | 123 |
| Montelukast Sodium | 269 | 102 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-02
- Last updated
- 2024-09-10
- Certified
- 2024-09-10
Frequently asked questions
- What is Hollis Underwood's NPI number?
- Hollis Underwood's National Provider Identifier (NPI) is 1770640369, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Hollis Underwood's specialty?
- Hollis Underwood is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Hollis Underwood located?
- Hollis Underwood's practice location on file with NPPES is 4420 E Mcdowell Rd, Phoenix, AZ 85008-4504.
- What is Hollis Underwood's phone number?
- The practice phone number listed in the NPPES registry for Hollis Underwood is (602) 858-4295.
- Does Hollis Underwood accept Medicare?
- Hollis Underwood is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Hollis Underwood's NPI active?
- Yes — Hollis Underwood's NPI (1770640369) is active in the NPPES registry as of the last update on 2024-09-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.