Dr. Merrill Marshall Ahrens, MD
- Medicare services, 2024
- 427
- Medicare patients, 2024
- 215
- Part D claims, 2024
- 268
- MIPS score, 2024
- 95
- Hospital affiliations
- 2
- Practice address
- 2801 N Gantenbein Avenue, Portland, OR 97227
- Practice phone
- Call (503) 413-2200
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Ahrens' professional email, personal email and mobile number
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Dr. Merrill Marshall Ahrens is an internist in Portland, Oregon
Dr. Ahrens practices at Legacy Emanuel Medical Center in Portland, Oregon, part of Legacy Health.
Dr. Ahrens' NPI, 1194839225, was assigned on August 18, 2006. Dr. Ahrens graduated from Northwestern University Feinberg Medical School in 1989. Dr. Ahrens holds Oregon license ORMD17736.
- NPI
- 1194839225NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5294825949
- NPI enumeration date
- August 18, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (503) 413-2200
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 63
- Medical school graduation
- 1989
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Merrill Marshall Ahrens practices at Legacy Emanuel Medical Center in Portland, Oregon
Dr. Ahrens' primary practice is Legacy Emanuel Medical Center, at 2801 N Gantenbein Avenue, Portland, OR 97227 in Multnomah County. The practice phone is (503) 413-2200.
- Legacy Emanuel Medical Center2801 N Gantenbein Avenue, Portland, OR 97227 · Multnomah CountyPhone(503) 413-2200
Source: Dmand AI Affiliation Data
Dr. Merrill Marshall Ahrens is affiliated with 4 sites of care and 3 medical groups
Dr. Ahrens' primary practice is Legacy Emanuel Medical Center in Portland, Oregon, part of Legacy Health. Dr. Ahrens is also affiliated with Legacy Good Samaritan Medical Center. The medical group on file is Legacy Medical Group-Northwest. Dmand AI also links Dr. Ahrens to 2 more medical groups, 1 clinical lab and 1 therapy and rehab clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Merrill Marshall Ahrens' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ahrens practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Legacy Emanuel Medical Center | Available with a free account |
| +3 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Merrill Marshall Ahrens is one of 1,680 internists in Oregon
Internal medicine is Dr. Ahrens' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Ahrens is licensed in Oregon.
Specialties and state licenses
- Internal medicine, OregonPrimary
Internists near Dr. Ahrens
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Merrill Marshall Ahrens billed Medicare for 427 services in 2024
CMS data shows 427 Medicare services from Dr. Ahrens across 4 procedure codes in 2024, for 215 Medicare patients. Medicare paid $16,724 for them.
Dr. Ahrens' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1612024: 21835%
- Other services
- 2023: 02024: 209
Where Dr. Ahrens' Medicare services took place, 2024
- In an office31975%
- In a facility10825%
Dr. Ahrens compared with the Oregon median for internists, 2024
- Dr. Ahrens
- Oregon median
- Medicare services
- 427vs 30042% above
- Medicare patients
- 215vs 13263% above
- Part D claims
- 46vs 22279% below
Medians across 1,791 internists in Oregon with Dmand AI profiles that report each measure.
Dr. Ahrens' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Merrill Marshall Ahrens treated 215 Medicare patients in 2024, average age 71
CMS counts 215 Medicare patients who saw Dr. Ahrens in 2024. The largest group is 65 to 74, with 106 patients. 65% of them have high blood pressure, and 59% have high cholesterol. 32% are also on Medicaid. Their average risk score is 1.11, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Ahrens' median patient age at 67, with 54% women.
Dr. Ahrens' Medicare patients by age, 2024
Dr. Ahrens' Medicare patients by sex, 2024
- Women12056%
- Men9544%
Chronic conditions among Dr. Ahrens' Medicare patients, 2024
- High blood pressure65%
- High cholesterol59%
- Arthritis40%
- Mood disorders34%
- Anxiety28%
- Depression28%
- Ischemic heart disease24%
- Diabetes22%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ahrens' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Merrill Marshall Ahrens wrote 268 Medicare Part D claims in 2024
In 2024, Dr. Ahrens wrote 268 Medicare Part D claims for 115 patients. 88% of them were for generic drugs. CMS names the drug for 46 of them, across 3 drugs with 11 or more claims each, at $473 in total drug cost. In 2023, CMS named 46 claims across 3 drugs.
Dr. Ahrens' Part D claims by kind of drug, 2024
- Generic235 claims88%
- Brand-name and other33 claims12%
Dr. Ahrens' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 462024: 46No change
Drugs named by CMS: 3 in 2024, 3 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Merrill Marshall Ahrens scored 95 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 95 out of 100 for Dr. Ahrens for performance year 2024, reported through an alternative payment model (APM). Dr. Ahrens accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Ahrens as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Ahrens' MIPS scores, performance year 2024
- 95of 100Final score
- 77.2of 100Quality
- 99of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Removal of skin lesions: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Merrill Marshall Ahrens graduated from Northwestern University Feinberg Medical School
Dr. Ahrens graduated from Northwestern University Feinberg Medical School in 1989.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Merrill Marshall Ahrens's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Merrill Marshall Ahrens
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Merrill Marshall Ahrens' NPI number?
Dr. Merrill Marshall Ahrens' NPI number is 1194839225. It was assigned on August 18, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Merrill Marshall Ahrens?
Dr. Merrill Marshall Ahrens is an internist in Portland, Oregon. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Merrill Marshall Ahrens practice?
Dr. Ahrens practices at 2801 N Gantenbein Avenue, Portland, OR 97227. Dr. Ahrens' primary practice is Legacy Emanuel Medical Center in Portland, Oregon, part of Legacy Health. Dmand AI also links Dr. Ahrens to 2 medical groups, 1 clinical lab and 1 therapy and rehab clinic.
What is Dr. Merrill Marshall Ahrens' office phone number?
The practice phone on file for Dr. Ahrens is (503) 413-2200.
What is Dr. Merrill Marshall Ahrens' medical license number?
Dr. Ahrens holds Oregon license ORMD17736.
Which hospitals is Dr. Merrill Marshall Ahrens affiliated with?
Dr. Ahrens practices at Legacy Emanuel Medical Center in Portland, Oregon. Dr. Ahrens is also affiliated with Legacy Good Samaritan Medical Center.
What medical group is Dr. Merrill Marshall Ahrens part of?
Dr. Ahrens is linked to Legacy Medical Group-Northwest. Dmand AI links Dr. Ahrens to 2 more medical groups.
Does Dr. Merrill Marshall Ahrens accept Medicare?
Yes. CMS data shows Dr. Ahrens billed Medicare for 427 services in 2024, and Dr. Ahrens accepts Medicare assignment.
Does Dr. Merrill Marshall Ahrens offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Ahrens as offering telehealth services.
What is Dr. Merrill Marshall Ahrens' MIPS score?
Dr. Ahrens' MIPS final score for performance year 2024 is 95 out of 100, reported through an alternative payment model (APM).
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How many Medicare patients does Dr. Merrill Marshall Ahrens see?
CMS counts 215 Medicare patients who saw Dr. Ahrens in 2024, with an average age of 71.
What services does Dr. Merrill Marshall Ahrens bill to Medicare?
In 2024, Dr. Ahrens' most billed Medicare services were medicare service (G2211), office visit, established patient (99213) and office visit, established patient (99214).
Where did Dr. Merrill Marshall Ahrens go to medical school?
Dr. Ahrens graduated from Northwestern University Feinberg Medical School in 1989.
What drugs does Dr. Merrill Marshall Ahrens prescribe most?
In 2024 Medicare Part D data, Dr. Ahrens' most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Lisinopril.
How long has Dr. Merrill Marshall Ahrens been practicing?
Dr. Ahrens graduated from medical school in 1989, 37 years ago.
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