Hollis J. C. Underwood, M.D.
Internal Medicine Physician · Phoenix, AZ
Hollis J. C. Underwood, M.D. is an internal medicine physician with a practice address in Phoenix, Arizona, and NPI 1770640369, issued on Jan 2, 2007. Check the license (Arizona 22415, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Hollis J. C. Underwood
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 22415 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 4420 E Mcdowell RD, Phoenix, AZ 85008
- Phone
- (602) 858-4295
- Enumerated
- Jan 2, 2007
- Record last updated
- Sep 10, 2024
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,853 in Arizona → Look up another NPI →
Also registered at 4420 E Mcdowell RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Hollis J. C. Underwood in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 22415Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.4 times the Medicare Part D claims of the average internal medicine physician in 2024
10,831 Medicare Part D claims for 1,015 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 222 claims were for opioids.
Most prescribed
- Atorvastatin Calcium668 claims
- Rosuvastatin Calcium627 claims
- Amlodipine Besylate609 claims
- Levothyroxine Sodium452 claims
- Pantoprazole Sodium342 claims
- Montelukast Sodium269 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Hollis J. C. Underwood among 2,853 internal medicine physician records in Arizona
Hollis J. C. Underwood, M.D. is one of 2,853 internal medicine physician records with a practice address in Arizona. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 45% of them.
- NPI issued2007 · 45% of these records are older, 47% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2024 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
695 internal medicine physician records list a practice address in Phoenix
They are 695 of the 31,399 NPPES records with a practice address in Phoenix, and 2,853 internal medicine physician records in Arizona.
All 2,853 in Arizona → Every provider in Phoenix → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Sunitha Bandlamuri, MDPhoenix, AZ 850081366496812
- Bhagyashree Barlingay, MDPhoenix, AZ 850081558322081
- Stephanie Berkshire, DOPhoenix, AZ 850081003853078
- Steve Kaplan, M.D.Phoenix, AZ 850081568418457
- Mohammed Khan, MDPhoenix, AZ 850081245270347
- Jasminder Mand, MDPhoenix, AZ 850081720021454
- Stephen Meenahan, DOPhoenix, AZ 850081396785036
- Lakshmi Murthy, MDPhoenix, AZ 850081588604128
Common questions
What is Hollis J. C. Underwood, M.D.'s NPI number?
Hollis J. C. Underwood, M.D.'s National Provider Identifier (NPI) is 1770640369, issued on Jan 2, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Hollis J. C. Underwood, M.D. located?
The NPPES record lists a practice address at 4420 E Mcdowell RD, Phoenix, AZ, 85008. Phone: (602) 858-4295. Providers update this record themselves, so call before visiting.
How can I verify Hollis J. C. Underwood, M.D.'s license?
NPPES lists Arizona license number 22415, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Hollis J. C. Underwood, M.D. prescribe under Medicare Part D?
In 2024, Hollis J. C. Underwood, M.D. had 10,831 Medicare Part D claims for 1,015 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.