Merrill Marshall Ahrens, MD
Internal Medicine Physician · Portland, OR
Merrill Marshall Ahrens, MD is an internal medicine physician with a practice address in Portland, Oregon, and NPI 1194839225, issued on Aug 18, 2006. Check the license (Oregon ORMD17736, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Merrill Marshall Ahrens
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- ORMD17736 OR
Self-reported in NPPES; status is on the state search - Practice location
- 19500 SE Stark St, Portland, OR 97233
- Phone
- (503) 669-3900
- Enumerated
- Aug 18, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20071218000299); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 1989
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,116 in Oregon → Look up another NPI →
Also registered at 19500 SE Stark St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Christopher Alaka, RPH, C.C.R.APharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1083982706
- Nicolle AsencioFamily Nurse Practitioner1225753692
- Richard Babal, MANAGEROptician1295824282
- Thomas Beaver, M.D.Internal Medicine Physician1215019112
- Jennifer Bishop, MDInternal Medicine Physician1548284557
- Bill Blessington, MDInternal Medicine Physician1316443674
Verify Merrill Marshall Ahrens in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license ORMD17736Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average internal medicine physician in 2024
268 Medicare Part D claims for 115 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium19 claims
- Levothyroxine Sodium14 claims
- Lisinopril13 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 86.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 3 group practices
- Legacy Clinics LLCPortland, OR
- Legacy Emanuel Hospital And Health CenterPortland, OR
- Legacy Good Samaritan Hospital And Medical CenterPortland, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Merrill Marshall Ahrens among 2,116 internal medicine physician records in Oregon
Merrill Marshall Ahrens, MD 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
- Graduated1989 · median 2008 among the 1,232 with a school on file
- Record last updated2007 · 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).
889 internal medicine physician records list a practice address in Portland
They are 889 of the 42,088 NPPES records with a practice address in Portland, and 2,116 internal medicine physician records in Oregon.
All 2,116 in Oregon → Every provider in Portland → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Thomas Beaver, M.D.Portland, OR 972331215019112
- Jennifer Bishop, MDPortland, OR 972331548284557
- Benjamin Brody, M.D.Portland, OR 972331245243799
- Brian Gould, M.D.Portland, OR 972331073535266
- Glenn Greeder, MDPortland, OR 972331821184250
- June GreenePortland, OR 972331932284346
- Max Grishkevich, MDPortland, OR 972331477518637
- Robert Jones, MDPortland, OR 972331932216165
Common questions
What is Merrill Marshall Ahrens, MD's NPI number?
Merrill Marshall Ahrens, MD's National Provider Identifier (NPI) is 1194839225, issued on Aug 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Merrill Marshall Ahrens, MD located?
The NPPES record lists a practice address at 19500 SE Stark St, Portland, OR, 97233. Phone: (503) 669-3900. Providers update this record themselves, so call before visiting.
How can I verify Merrill Marshall Ahrens, MD's license?
NPPES lists Oregon license number ORMD17736, 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 Merrill Marshall Ahrens, MD prescribe under Medicare Part D?
In 2024, Merrill Marshall Ahrens, MD had 268 Medicare Part D claims for 115 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Merrill Marshall Ahrens, MD's MIPS final score?
The 2023 MIPS final score is 86.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.