Kathleen J. Weiss, MD
Internal Medicine Physician · Littleton, CO
Kathleen J. Weiss, MD is an internal medicine physician with a practice address in Littleton, Colorado, and NPI 1104077585, issued on Oct 3, 2008. Check the license (Colorado DR.0050446, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Kathleen J. Weiss
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- DR.0050446 CO
57.015992 OH
Self-reported in NPPES; status is on the state search - Practice location
- 8199 Southpark LN, Littleton, CO 80120
- Phone
- (303) 730-3332
- Enumerated
- Oct 3, 2008
- Record last updated
- Nov 18, 2024
- Fax
- (303) 730-7766
- Medicare enrollment
- Enrolled (PECOS I20111219000926); accepts Medicare assignment
- Medical or professional school
- University Of Utah School Of Medicine, 2008
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Also registered at 8199 Southpark LN
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Amir Fereydouni, DMDGeneral Practice Dentistry1851364012
- Gayle Fischer, DPTPhysical Therapist1639267859
- Lisa Gidday, MDInternal Medicine Physician1518948736
- Charles Lee, MDInternal Medicine Physician1194706978
Verify Kathleen J. Weiss in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license DR.0050446Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average internal medicine physician in 2024
6,624 Medicare Part D claims for 779 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 113 claims were for opioids.
Most prescribed
- Levothyroxine Sodium558 claims
- Atorvastatin Calcium516 claims
- Losartan Potassium273 claims
- Amlodipine Besylate224 claims
- Lisinopril215 claims
- Rosuvastatin Calcium215 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.
Bills Medicare through one group practice
- Optumcare Colorado Medical Group LLCColorado Springs, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kathleen J. Weiss among 2,046 internal medicine physician records in Colorado
Kathleen J. Weiss, MD is one of 2,046 internal medicine physician records with a practice address in Colorado. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 61% of them.
- NPI issued2008 · 61% of these records are older, 35% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2008 · median 2006 among the 1,090 with a school on file
- Record last updated2024 · 61% 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 Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
60 internal medicine physician records list a practice address in Littleton
They are 60 of the 3,918 NPPES records with a practice address in Littleton, and 2,046 internal medicine physician records in Colorado.
All 2,046 in Colorado → Every provider in Littleton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Teng Chang, M.D.Littleton, CO 801201255312328
- Lisa Gidday, MDLittleton, CO 801201518948736
- William Gipson, M.D.Littleton, CO 801201023003316
- Charles Lee, MDLittleton, CO 801201194706978
- Ronald Miller, MDLittleton, CO 801201639153141
- Jason Pereira, MDLittleton, CO 801201003903139
- David Yu, M.D.Littleton, CO 801201114182003
- Stephanus Tjan, M.D.Littleton, CO 801211609888429
Common questions
What is Kathleen J. Weiss, MD's NPI number?
Kathleen J. Weiss, MD's National Provider Identifier (NPI) is 1104077585, issued on Oct 3, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Kathleen J. Weiss, MD located?
The NPPES record lists a practice address at 8199 Southpark LN, Littleton, CO, 80120. Phone: (303) 730-3332. Providers update this record themselves, so call before visiting.
How can I verify Kathleen J. Weiss, MD's license?
NPPES lists Colorado license number DR.0050446, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Kathleen J. Weiss, MD prescribe under Medicare Part D?
In 2024, Kathleen J. Weiss, MD had 6,624 Medicare Part D claims for 779 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.