Charles Keith Cofas, M.D.
Internal Medicine Physician · Klamath Falls, OR
Charles Keith Cofas, M.D. is an internal medicine physician with a practice address in Klamath Falls, Oregon, and NPI 1053371666, issued on Mar 27, 2006. Check the license (Oregon MD25846, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Charles Keith Cofas
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD25846 OR
Self-reported in NPPES; status is on the state search - Practice location
- 2640 Biehn St Ste 4, Klamath Falls, OR 97601
- Phone
- (541) 882-3818
- Enumerated
- Mar 27, 2006
- Record last updated
- Mar 29, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (541) 882-9800
- Medicaid ID
- 027754 OR
- Medicare enrollment
- Enrolled (PECOS I20060413000484); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical Branch At Galveston, 2002
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,116 in Oregon → Look up another NPI →
Verify Charles Keith Cofas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD25846Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
31% more Medicare Part D claims than the average internal medicine physician in 2024
4,176 Medicare Part D claims for 322 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 45 claims were for opioids.
Most prescribed
- Levothyroxine Sodium258 claims
- Atorvastatin Calcium232 claims
- Amlodipine Besylate225 claims
- Lisinopril162 claims
- Losartan Potassium131 claims
- Rosuvastatin Calcium109 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 2 group practices
- Cofas IncKlamath Falls, OR
- Sky Lakes Medical Center IncKlamath Falls, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Charles Keith Cofas among 2,116 internal medicine physician records in Oregon
Charles Keith Cofas, M.D. is one of 2,116 internal medicine physician records with a practice address in Oregon. 73% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 54% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2002 · median 2008 among the 1,232 with a school on file
- Record last updated2011 · 58% 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 Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Internal Medicine Physician providers in Oregon
There are 2,116 internal medicine physician records in Oregon.
All 2,116 in Oregon → Every provider in Klamath Falls → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Christopher Brown, MDKlamath Falls, OR 976011518353549
- Charles Christensen, MDKlamath Falls, OR 976011801970983
- Sidra Iftikhar, MDKlamath Falls, OR 976011457912966
- Chin Hee Jun, M.D.Klamath Falls, OR 976011477708790
- Mahi Khan, M.D.Klamath Falls, OR 976011699967521
- Kieran Kubac, MDKlamath Falls, OR 976011114487741
- Slavka Kucinska, MDKlamath Falls, OR 976011982698221
- Frank Marx, MDKlamath Falls, OR 976011942296678
Common questions
What is Charles Keith Cofas, M.D.'s NPI number?
Charles Keith Cofas, M.D.'s National Provider Identifier (NPI) is 1053371666, issued on Mar 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Charles Keith Cofas, M.D. located?
The NPPES record lists a practice address at 2640 Biehn St Ste 4, Klamath Falls, OR, 97601. Phone: (541) 882-3818. Providers update this record themselves, so call before visiting.
How can I verify Charles Keith Cofas, M.D.'s license?
NPPES lists Oregon license number MD25846, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Charles Keith Cofas, M.D. prescribe under Medicare Part D?
In 2024, Charles Keith Cofas, M.D. had 4,176 Medicare Part D claims for 322 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.