Stephanus Joseph Tjan, M.D.
Internal Medicine Physician · Littleton, CO
Stephanus Joseph Tjan, M.D. is an internal medicine physician with a practice address in Littleton, Colorado, and NPI 1609888429, issued on Aug 12, 2006. Check the license (Colorado 49802, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Stephanus Joseph Tjan
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 49802 CO
Self-reported in NPPES; status is on the state search - Practice location
- 191 E Orchard RD Ste 203, Littleton, CO 80121
- Phone
- (303) 459-2150
- Enumerated
- Aug 12, 2006
- Record last updated
- Jul 20, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (855) 751-4155
- Medicaid ID
- 72181281 CO
- Medicare enrollment
- Enrolled (PECOS I20150810001746); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Verify Stephanus Joseph Tjan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 49802Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
48% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,657 Medicare Part D claims for 84 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 63 claims were for opioids.
Most prescribed
- Atorvastatin Calcium93 claims
- Levothyroxine Sodium59 claims
- Amlodipine Besylate54 claims
- Metoprolol Succinate49 claims
- Tamsulosin Hcl42 claims
- Spironolactone39 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.
Stephanus Joseph Tjan among 2,046 internal medicine physician records in Colorado
Stephanus Joseph Tjan, M.D. 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 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1966 · median 2006 among the 1,090 with a school on file
- Record last updated2021 · 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
- David Conway, MDLittleton, CO 801221164415691
- Paul Davidson, MDLittleton, CO 801221760456412
- Andy FineLittleton, CO 801221245261965
- Lisa Gidday, MDLittleton, CO 801201518948736
- William Gipson, M.D.Littleton, CO 801201023003316
- Richard Good, MDLittleton, CO 801221669465183
- Nancy Hooyman, M.D.Littleton, CO 801221952356339
Common questions
What is Stephanus Joseph Tjan, M.D.'s NPI number?
Stephanus Joseph Tjan, M.D.'s National Provider Identifier (NPI) is 1609888429, issued on Aug 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephanus Joseph Tjan, M.D. located?
The NPPES record lists a practice address at 191 E Orchard RD Ste 203, Littleton, CO, 80121. Phone: (303) 459-2150. Providers update this record themselves, so call before visiting.
How can I verify Stephanus Joseph Tjan, M.D.'s license?
NPPES lists Colorado license number 49802, 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 Stephanus Joseph Tjan, M.D. prescribe under Medicare Part D?
In 2024, Stephanus Joseph Tjan, M.D. had 1,657 Medicare Part D claims for 84 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.