Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Hollis J. C. Underwood, MD

Individual provider Internal Medicine Physician · NPI 1770640369

Dr. Hollis J. C. Underwood, MD practises Internal Medicine in Phoenix, Arizona. Graduated from Howard University College of Medicine in 1983, 43 years ago. Practices with Archwell Health Professional Services of Arizona, LLC, an 8-clinician group and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
43
Trained at
Howard University College of Medicine
Licensed in
AZ
In the registry since
2007
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

4420 E McDowell Rd
Phoenix, AZ 85008-4504
Phone: (602) 858-4295
Show map & directions

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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 22415 (AZ)
Specialist Taxonomy 174400000X · Licence 22415 (AZ)

Record details

NPI number1770640369
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 2, 2007
Last updated in NPPESSeptember 10, 2024
Certification dateSeptember 10, 2024

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolHOWARD UNIVERSITY COLLEGE OF MEDICINE
Graduated 1983 (43 years in practice)
Group practice Archwell Health Professional Services Of Arizona, Llc — 8 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Skin biopsy 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients277
Services billed 792 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Archwell Health Professional Services of Arizona, LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 8 clinicians in the practice; 5 are shown here.

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