Active NPI 1356540827 Individual Practitioner Male Practitioner

Dr. Charles Earl Ahrens , MD

Ophthalmology • Duluth, MN

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Charles Ahrens, MD is a certified Ophthalmology practicing in Duluth, MN. With approximately 19 years of clinical experience since graduating from Sanford School Of Medicine Of University Of South Dakota in 2007, Dr. Ahrens delivers high-quality medical care to the local community at 4190 LOBERG AVE.

Dr. Ahrens is affiliated with St. Luke'S Hospital Of Duluth and accepts Medicare assignment.

Frequently performed procedures and clinical services include imaging of retina, established patient complete exam of visual system, injection of drug into eye. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

4190 Loberg Ave

Duluth, MN 558112652

Telephone 2182494600

Fax 2182494666

Associated Practice Facility / Clinic

🏢 St. Luke's Hospital Of Duluth Facility NPI 1609828029

Medicare Profile & Education

Medical School

Sanford School Of Medicine Of University Of South Dakota

Graduation Year

2007

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Ophthalmology in Duluth, MN

Established Specialist (10-20 Yrs)

Practitioner Clinical Experience

19 Yrs -3.7 yrs vs City Avg

City Avg: 22.7 Yrs

State Avg: 24.4 Yrs

Regional Practice Density

19 Specialists

Practicing in Duluth, MN (457 Statewide)

Telehealth Adoption Rate

0.0% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

80.3% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Ahrens (19 Years) 19 Yrs

Duluth Specialty Average (22.7 Years) 22.7 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
92134 Imaging of retina	359	94	$121.56	$30.56
92014 Established patient complete exam of visual system	270	269	$221.98	$87.90
67028 Injection of drug into eye	255	43	$427.27	$104.65
99213 Established patient office or other outpatient visit, typically 15 minutes	239	129	$122.14	$68.99
92136 Measurement of corneal curvature and depth of eye	113	62	$130.84	$30.61
66984 Removal of cataract with insertion of lens	103	61	$4280.49	$510.90
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	83	78	$154.37	$98.42
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	47	47	$248.81	$135.72
92083 Exam of visual field with extended testing	47	46	$140.89	$36.84
J9035 Injection, bevacizumab, 10 mg	42	11	$220.76	$73.00
92133 Imaging of optic nerve	36	36	$128.22	$22.65
92004 New patient complete exam of visual system	26	26	$270.77	$104.67
66821 Removal of recurring cataract in lens capsule using a laser	21	17	$1794.19	$310.17
92025 Ct scan of cornea	11	11	$53.36	$19.07

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
92134 Imaging of retina	371	90	$137.13	$31.47
99213 Established patient office or other outpatient visit, typically 15 minutes	279	130	$136.98	$72.48
92014 Established patient complete exam of visual system	251	251	$241.13	$92.89
67028 Injection of drug into eye	226	45	$325.39	$109.88
92136 Measurement of corneal curvature and depth of eye	94	61	$94.10	$33.22
66984 Removal of cataract with insertion of lens	93	53	$2220.00	$517.31
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	80	74	$175.22	$99.95
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	57	57	$240.77	$137.18
92133 Imaging of optic nerve	47	47	$99.28	$25.30
92083 Exam of visual field with extended testing	39	38	$121.21	$33.37
92004 New patient complete exam of visual system	24	24	$280.33	$112.94
66821 Removal of recurring cataract in lens capsule using a laser	20	16	$994.00	$333.19
92025 Ct scan of cornea	16	16	$42.00	$19.26

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
92134 Imaging of retina	397	88	$115.23	$31.78
67028 Injection of drug into eye	302	46	$312.89	$106.91
99213 Established patient office or other outpatient visit, typically 15 minutes	274	137	$134.44	$73.07
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	210	195	$234.07	$110.05
J0178 Injection, aflibercept, 1 mg	190	13	$2161.00	$901.48
92014 Established patient complete exam of visual system	115	115	$164.10	$79.91
66984 Removal of cataract with insertion of lens	108	63	$2150.00	$507.57
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	86	86	$322.67	$145.37
92136 Measurement of corneal curvature and depth of eye	72	70	$118.60	$38.37
J9035 Injection, bevacizumab, 10 mg	54	12	$96.38	$68.29
92133 Imaging of optic nerve	46	41	$97.98	$26.55
92083 Exam of visual field with extended testing	37	35	$134.11	$38.47
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	23	18	$71.13	$38.86
92004 New patient complete exam of visual system	22	22	$176.82	$97.17
66821 Removal of recurring cataract in lens capsule using a laser	15	11	$963.00	$317.63
92025 Ct scan of cornea	11	11	$40.00	$19.07

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	379	166	$149.03	$77.64
92134 Imaging of retina	367	90	$108.41	$32.65
67028 Injection of drug into eye	302	41	$356.32	$103.38
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	215	202	$248.54	$118.27
92014 Established patient complete exam of visual system	163	163	$136.52	$77.77
66984 Removal of cataract with insertion of lens	98	63	$2150.00	$524.19
J9035 Injection, bevacizumab, 10 mg	81	11	$96.38	$71.24
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	72	40	$89.29	$45.92
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	71	71	$332.06	$149.94
92136 Measurement of corneal curvature and depth of eye	64	64	$117.74	$41.42
92083 Exam of visual field with extended testing	53	53	$120.81	$40.02
92133 Imaging of optic nerve	34	34	$92.53	$27.11
92004 New patient complete exam of visual system	25	25	$148.91	$96.65
65855 Laser repair to improve eye fluid flow	20	13	$610.02	$220.10
66982 Complex removal of cataract with insertion of prosthetic lens	17	12	$3618.00	$745.05
66821 Removal of recurring cataract in lens capsule using a laser	17	12	$913.00	$323.61
92025 Ct scan of cornea	11	11	$40.00	$19.56

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
92134 Imaging of retina	285	84	$93.32	$29.23
99213 Established patient office or other outpatient visit, typically 15 minutes	255	140	$110.02	$59.64
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	245	224	$182.24	$90.86
67028 Injection of drug into eye	209	39	$538.24	$102.07
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	198	46	$72.50	$34.28
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	109	109	$307.65	$144.91
66984 Removal of cataract with insertion of lens	79	46	$2150.00	$525.59
92136 Measurement of corneal curvature and depth of eye	45	44	$136.34	$42.01
92133 Imaging of optic nerve	41	40	$90.83	$24.91
92014 Established patient complete exam of visual system	39	39	$117.82	$83.10
92083 Exam of visual field with extended testing	36	35	$125.17	$45.54
92004 New patient complete exam of visual system	12	12	$171.08	$96.06
92201 Extended exam of the back part of the eye with retinal drawing	12	11	$24.20	$23.25

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	315	289	$177.22	$90.63
92134 Imaging of retina	289	79	$96.14	$30.88
99213 Established patient office or other outpatient visit, typically 15 minutes	263	142	$113.84	$59.03
67028 Injection of drug into eye	245	37	$530.59	$101.03
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	222	42	$69.75	$33.97
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	147	147	$250.59	$137.36
J0178 Injection, aflibercept, 1 mg	112	11	$2161.00	$943.02
92136 Measurement of corneal curvature and depth of eye	69	67	$190.56	$45.92
66984 Removal of cataract with insertion of lens	62	43	$2952.50	$624.64
92083 Exam of visual field with extended testing	49	45	$129.53	$47.85
92133 Imaging of optic nerve	48	47	$95.67	$28.48
66982 Complex removal of cataract with insertion of prosthetic lens	21	14	$3618.00	$770.37
92225 Examination of eye by ophthalmoscope with retinal drawing	20	20	$36.73	$23.34
66984 Removal of cataract with insertion of lens	14	12	$2861.70	$631.87
92020 Examination of cornea and iris using lens device and slit lamp	11	11	$43.59	$23.84

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	266	140	$123.36	$60.43
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	256	223	$176.62	$89.72
92134 Imaging of retina	224	71	$99.51	$34.53
67028 Injection of drug into eye	188	34	$591.37	$100.20
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	126	126	$192.53	$133.25
66984 Removal of cataract with insertion of lens	66	42	$3153.83	$622.38
92083 Exam of visual field with extended testing	52	52	$111.05	$45.59
J9035 Injection, bevacizumab, 10 mg	50	13	$96.38	$76.65
92136 Measurement of corneal curvature and depth of eye	43	42	$127.27	$49.33
92133 Imaging of optic nerve	42	42	$93.51	$29.09
66821 Removal of recurring cataract in lens capsule using a laser	15	13	$704.00	$306.44
92020 Examination of cornea and iris using lens device and slit lamp	14	13	$26.78	$21.58
92225 Examination of eye by ophthalmoscope with retinal drawing	11	11	$23.04	$21.47

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	266	147	$117.57	$59.95
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	248	226	$202.63	$92.50
92134 Imaging of retina	229	80	$104.81	$36.02
67028 Injection of drug into eye	167	29	$816.33	$101.85
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	150	150	$192.55	$130.55
J9035 Injection, bevacizumab, 10 mg	102	16	$96.38	$73.15
66984 Removal of cataract with insertion of lens	58	37	$3254.54	$629.39
92136 Measurement of corneal curvature and depth of eye	49	46	$135.54	$56.71
92083 Exam of visual field with extended testing	47	42	$123.05	$49.89
92133 Imaging of optic nerve	38	36	$95.44	$29.19
92225 Examination of eye by ophthalmoscope with retinal drawing	15	14	$44.94	$23.58

Medical Specialties & State Licenses

CMS Verified: 2020-12-04

Ophthalmology Primary Specialty

NUCC Taxonomy Code: 207W00000X

State License MN 53850

An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.

Hospital & Practice Group Affiliations

St. Luke's Hospital Of Duluth

1120 E 34th St, Hibbing, MN 557462909

Phone: 2183627100

St. Luke's Hospital Of Duluth

915 E 1st St, Duluth, MN 558052107

Phone: 2182495439

St. Luke's Hospital Of Duluth

1011 E 1st St, Duluth, MN 558052242

Phone: 2182497000

St. Luke's Hospital Of Duluth

4190 Loberg Ave, Duluth, MN 558112652

Phone: 2182494600

St. Luke's Hospital Of Duluth

1015 E 1st St, Duluth, MN 558052242

Phone: 2182497860

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

13 Associated Practitioners

Dr. Lauren Wallace , MD

Family Medicine

NPI 1063828184

Doctor of Medicine (M.D.)

Dr. Elizabeth Liljeblad , MD

Family Medicine

NPI 1104875632

Doctor of Medicine (M.D.)

Dr. Gerard Spoelhof , MD

Family Medicine

NPI 1124058847

Doctor of Medicine (M.D.)

Dr. Benjamin Johnson , MD

Family Medicine

NPI 1164428280

Doctor of Medicine (M.D.)

Daniel Campbell

Emergency Medicine

NPI 1184653065

Dr. Matthew Penning , MD

Family Medicine

NPI 1427285543

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

11 Historical Events

✅

NPI Profile Active February 07, 2017

NPI status registered as active in NPPES database

📍

Updated Practice Location February 07, 2017

Registered at 4190 LOBERG AVE, DULUTH, MN 558112652 (Tel: 2182494600)

📍

Updated Business Mailing Address February 07, 2017

Registered at 4190 LOBERG AVE, DULUTH, MN 558112652 (Tel: 2182494600)

👤

Provider Name / Credentials Updated February 07, 2017

Recorded as CHARLES AHRENS, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) February 07, 2017

Ophthalmology (License #53850 in MN)

✅

NPI Profile Active September 29, 2011

NPI status registered as active in NPPES database

📍

Updated Practice Location September 29, 2011

Registered at 4413 AIRBASE ROAD, HERMANTOWN, MN 558111847 (Tel: 2187203553)

📍

Updated Business Mailing Address September 29, 2011

Registered at 4413 AIRBASE ROAD, 400 FSC - PCS, HERMANTOWN, MN 558111847 (Tel: 2187203553)

👤

Provider Name / Credentials Updated September 29, 2011

Recorded as CHARLES AHRENS, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) September 29, 2011

Internal Medicine (License #4301090601 in MI)

🟢

Initial NPI Registration & Enumeration July 16, 2007

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1356540827

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: July 16, 2007

Last Update: December 04, 2020

Sole Proprietor: No

Update or Correct Profile

Mailing Address

4190 Loberg Ave

Duluth, MN 558112652

Phone: 2182494600

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.