William Ripley Ballou
Infectious Disease Physician · Rockville, MD
William Ripley Ballou is an infectious disease physician with a practice address in Rockville, Maryland, and NPI 1982076394, issued on Oct 25, 2015. Check the license (Maryland D0030157, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- William Ripley Ballou
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- D0030157 MD
Self-reported in NPPES; status is on the state search - Practice location
- 14200 Shady Grove RD, Rockville, MD 20850
- Phone
- (301) 204-4062
- Enumerated
- Oct 25, 2015
- Record last updated
- Oct 25, 2015 (not updated in 11 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 410 in Maryland → Look up another NPI →
Verify William Ripley Ballou in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D0030157Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average infectious disease physician in 2024
24 Medicare Part D claims, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D.
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.
William Ripley Ballou among 410 infectious disease physician records in Maryland
William Ripley Ballou is one of 410 infectious disease physician records with a practice address in Maryland. 59% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 85% of them.
- NPI issued2015 · 85% of these records are older, 11% newer
- In a Medicare fileYes · 59% of these records are
- In the CMS Doctors and Clinicians fileNo · 49% of these records are
- Record last updated2015 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in Maryland
There are 410 infectious disease physician records in Maryland.
All 410 in Maryland → Every provider in Rockville → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Gloria Aggrey, MDRockville, MD 208501588839286
- Sameh Aly, M.D.Rockville, MD 208501245287572
- Ali Asad Arastu, MDRockville, MD 208501912165028
- Dimitri Iarikov, MDRockville, MD 208501326268913
- Ruth Jacobs, M.D.Rockville, MD 208501497774913
- Vikas Kapoor, M.D,Rockville, MD 208501871711309
- Puran Mathur, M.D.Rockville, MD 208501578619375
- Philip Murphy, M.D.Rockville, MD 208501083980072
Common questions
What is William Ripley Ballou's NPI number?
William Ripley Ballou's National Provider Identifier (NPI) is 1982076394, issued on Oct 25, 2015. An NPI identifies a provider in billing; it is not a license.
Where is William Ripley Ballou located?
The NPPES record lists a practice address at 14200 Shady Grove RD, Rockville, MD, 20850. Phone: (301) 204-4062. Providers update this record themselves, so call before visiting.
How can I verify William Ripley Ballou's license?
NPPES lists Maryland license number D0030157, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Ripley Ballou prescribe under Medicare Part D?
In 2024, William Ripley Ballou had 24 Medicare Part D claims; the average among infectious disease physician prescribers was 689. 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.