Ruth S. Horowitz, MD
Endocrinology, Diabetes & Metabolism Physician · Timonium, MD
Ruth S. Horowitz, MD is an endocrinology, diabetes & metabolism physician with a practice address in Timonium, Maryland, and NPI 1003811423, issued on Jun 14, 2005. Check the license (Maryland D45811, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Ruth S. Horowitz
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- D45811 MD
Self-reported in NPPES; status is on the state search - Practice location
- 1 Texas Station CT, Timonium, MD 21093
- Phone
- (410) 828-7417
- Enumerated
- Jun 14, 2005
- Record last updated
- May 9, 2025
- Fax
- (410) 828-4695
- Medicaid IDs
- 053771300 MD
127701400 MD - Medicare enrollment
- Enrolled (PECOS I20040721001665); accepts Medicare assignment
- Medical or professional school
- University Of Cincinnati College Of Medicine, 1988
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 314 in Maryland → Look up another NPI →
Also registered at 1 Texas Station CT
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mark Bradford, P.A.Medical Physician Assistant1831137611
- Ashley Davidson, MDEndocrinology, Diabetes & Metabolism Physician1457481947
- Rivkah Horowitz, PA-CMedical Physician Assistant1639303084
- Tamara Irby, P.T.Physical Therapist1588796916
- Meena Khan, MDEndocrinology, Diabetes & Metabolism Physician1831200203
- Hyoen Joo Lee, NPNurse Practitioner1871859926
Verify Ruth S. Horowitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D45811Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
18% more Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
3,116 Medicare Part D claims for 511 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 40% of claims.
Most prescribed
- Levothyroxine Sodium369 claims
- Alendronate Sodium265 claims
- Synthroid261 claims
- Metformin Hcl128 claims
- Metformin Hcl Er109 claims
- Jardiance92 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.
Industry payments in 2024: $1,193.36
55 payments; by number, the most common kind was food and beverage; the largest payer was Sanofi-Aventis U.S. LLC. The 5,661 providers of this specialty with any payment received $5,742.15 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Privia Medical Group, LLCAnnapolis, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ruth S. Horowitz among 314 endocrinology, diabetes & metabolism physician records in Maryland
Ruth S. Horowitz, MD is one of 314 endocrinology, diabetes & metabolism physician records with a practice address in Maryland. 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 89% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated1988 · median 2003 among the 193 with a school on file
- Record last updated2025 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
9 endocrinology, diabetes & metabolism physician records list a practice address in Timonium
They are 9 of the 612 NPPES records with a practice address in Timonium, and 314 endocrinology, diabetes & metabolism physician records in Maryland.
All 314 in Maryland → Every provider in Timonium → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Ashley Davidson, MDTimonium, MD 210931457481947
- Craig Haber, MDTimonium, MD 210931255336673
- Meena Khan, MDTimonium, MD 210931831200203
- Jeffrey Mindel, MDTimonium, MD 210931821133091
- Xinyuan Ning, M.D.Timonium, MD 210931285166611
- Vivian Pao, MDTimonium, MD 210931265604870
- Hui Peng, MDTimonium, MD 210931518271071
- Thomas Pozefsky, M.D.Lutherville, MD 210931770584435
Common questions
What is Ruth S. Horowitz, MD's NPI number?
Ruth S. Horowitz, MD's National Provider Identifier (NPI) is 1003811423, issued on Jun 14, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Ruth S. Horowitz, MD located?
The NPPES record lists a practice address at 1 Texas Station CT, Timonium, MD, 21093. Phone: (410) 828-7417. Providers update this record themselves, so call before visiting.
How can I verify Ruth S. Horowitz, MD's license?
NPPES lists Maryland license number D45811, 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 Ruth S. Horowitz, MD prescribe under Medicare Part D?
In 2024, Ruth S. Horowitz, MD had 3,116 Medicare Part D claims for 511 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.