Charles Earl Ahrens, M.D.
Ophthalmology Physician · Duluth, MN
Charles Earl Ahrens, M.D. is an ophthalmology physician with a practice address in Duluth, Minnesota, and NPI 1356540827, issued on Jul 16, 2007. Check the license (Minnesota 53850, as entered in NPPES) on the Minnesota Board of Medical Practice; the Medicare figures below come from public CMS files.
- Name
- Charles Earl Ahrens
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- 53850 MN
Self-reported in NPPES; status is on the state search - Practice location
- 4190 Loberg Ave, Duluth, MN 55811
- Phone
- (218) 249-4600
- Enumerated
- Jul 16, 2007
- Record last updated
- Dec 4, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (218) 249-4666
- Medicare enrollment
- Enrolled (PECOS I20110915000829); accepts Medicare assignment
- Medical or professional school
- Sanford School Of Medicine Of University Of South Dakota, 2007
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 434 in Minnesota → Look up another NPI →
Also registered at 4190 Loberg Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Richard Fraser, NPFamily Nurse Practitioner1891748000
- Benjamin Johnson, MDFamily Medicine Physician1164428280
Verify Charles Earl Ahrens in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMinnesota Board of Medical Practice
Search for license 53850Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
20% fewer Medicare Part D claims than the average ophthalmology physician in 2024
1,219 Medicare Part D claims for 369 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 32% of claims.
Most prescribed
- Latanoprost252 claims
- Prednisolone Acetate153 claims
- Timolol Maleate125 claims
- Ketorolac Tromethamine115 claims
- Ofloxacin99 claims
- Tobramycin-Dexamethasone90 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.
Industry payments in 2024: $15.19
1 payment: food and beverage; the largest payer was Oyster Point Pharma, Inc. The 13,221 providers of this specialty with any payment received $4,535.02 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- St. Luke's Hospital OF DuluthDuluth, MN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Charles Earl Ahrens among 434 ophthalmology physician records in Minnesota
Charles Earl Ahrens, M.D. is one of 434 ophthalmology physician records with a practice address in Minnesota. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 56% of them.
- NPI issued2007 · 56% of these records are older, 38% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated2007 · median 2006 among the 282 with a school on file
- Record last updated2020 · 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 207W00000X and a Minnesota practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in Minnesota
There are 434 ophthalmology physician records in Minnesota.
All 434 in Minnesota → Every provider in Duluth → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Elisabeth Aponte, M.D.Duluth, MN 558111871725986
- Upali Aturaliya, MDDuluth, MN 558111912943846
- Todd Brittain, D.O.Hermantown, MN 558111073876397
- Lisa Graham, M.D.Duluth, MN 558111720059603
- Robert Hollenhorst, MDDuluth, MN 558111174569727
- Susan Relf, MDDuluth, MN 558111811925084
- Jeffrey Weis, M.D.Hermantown, MN 558111821183815
- Grishma Bharucha, M.D.Duluth, MN 558051609137363
Common questions
What is Charles Earl Ahrens, M.D.'s NPI number?
Charles Earl Ahrens, M.D.'s National Provider Identifier (NPI) is 1356540827, issued on Jul 16, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Charles Earl Ahrens, M.D. located?
The NPPES record lists a practice address at 4190 Loberg Ave, Duluth, MN, 55811. Phone: (218) 249-4600. Providers update this record themselves, so call before visiting.
How can I verify Charles Earl Ahrens, M.D.'s license?
NPPES lists Minnesota license number 53850, as entered by the provider. Search the Minnesota Board of Medical Practice at https://mn.gov/boards/medical-practice/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Charles Earl Ahrens, M.D. prescribe under Medicare Part D?
In 2024, Charles Earl Ahrens, M.D. had 1,219 Medicare Part D claims for 369 beneficiaries; the average among ophthalmology physician prescribers was 1,518. 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.