DR. GREGORY D OSMUNDSON M.D.
NPI 1255391801
Ophthalmology in Sioux Falls, SD

Q: What is Gregory Osmundson's NPI number?

The NPI number for Gregory Osmundson is 1255391801. It was assigned to this individual provider in the NPPES registry on March 27, 2006.

Q: What is Gregory Osmundson's specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

Q: When was this NPI record last updated?

The NPPES record for Gregory Osmundson was last updated on June 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since March 27, 2006PECOS EnrolledAccepts Medicare Assignment

6601 S MINNESOTA AVE, SUITE 200, SIOUX FALLS, SD 57108(605) 336-6294(605) 336-0266 Get Directions Write a Review

NPPES record last updated: June 11, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jan 3, 2023, Feb 17, 2021, Jun 20, 2018 and 1 more (4 updates tracked since 2017).

On this page

About Dr. Gregory D Osmundson M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GREGORY D OSMUNDSON M.D. (NPI 1255391801) is an individual ophthalmology provider in Sioux Falls, South Dakota, licensed in South Dakota (4573) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS, is affiliated with Prairie Lakes Healthcare System, Inc, and is a graduate of Sanford School Of Medicine Of University Of South Dakota (1994).

NPPES Registry Identity

NPI1255391801

Entity TypeIndividualMale

Primary Taxonomy207W00000X

Provider Legal NameDR. GREGORY D OSMUNDSONCredential: M.D.

Location Address6601 S MINNESOTA AVE, SUITE 200Sioux Falls, SD 57108

Mailing Address6601 S Minnesota Ave Ste 200Sioux Falls, SD 57108-2564 · (605) 336-6294 · Fax (605) 336-0266

Phone(605) 336-6294

Fax(605) 336-0266

Sole ProprietorNo

Medical School CMSSanford School Of Medicine Of University Of South DakotaGraduated 1994

Enumeration DateMarch 27, 2006

Last NPPES UpdateJune 11, 20264 updates tracked since enumeration

NPPES CertifiedJune 11, 2026

✔ NPI 1255391801 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOphthalmologyAllopathic & Osteopathic Physicians

Taxonomy Code207W00000X

License✔ Licensed in SD · 4573

Definition

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.

Also ListedOphthalmology · Glaucoma SpecialistTaxonomy 207WX0009X · License 4573 (SD)

6601 S MINNESOTA AVE, Sioux Falls, SD 57108

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Other Identifiers 11

Other123714MN · Ucare Mn

Medicaid137323400MN

OtherHP76197Healthpartners

Other46031185613NE · Ne Medicaid

Medicaid0524207IA

Medicaid6301490SD

Other663S4OSMN · Mnbs Non

Other6238SD · Sd Wellmark

Other4573SD · Dakotacare

Other06F30OSMN · Mn Blue Shield

Other25529IA · Wellmark Of Ia

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from NH Healthy Families, Ambetter from Sunflower Health Plan, Ambetter Health and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Gregory D Osmundson M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID446142491

PECOS Enrollment IDI20100126000817

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Gregory Osmundson reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Ophthalmology Ltd

Same address

Ophthalmology

6601 S MINNESOTA AVE, SUITE 200
Sioux Falls, SD 57108

Reassigned Medicare billing, South Dakota enrollment
14 clinicians in this Medicare group

NPI 1871589531 (605) 336-6294

Lac Qui Parle Clinic Of Madison Inc

109 mi

Rural Health

820 3RD AVE
Madison, MN 56256

Reassigned Medicare billing, Minnesota enrollment
185 clinicians in this Medicare group

NPI 1144266156 (320) 598-7551

Madison Healthcare Services

109 mi

Critical Access

820 3RD AVE
Madison, MN 56256

Reassigned Medicare billing, Minnesota enrollment
177 clinicians in this Medicare group

NPI 1942246848 (320) 598-7536

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 14

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Removal of cataract with insertion of prosthetic lens 66984

This is a procedure where a cloudy lens in your eye, known as a cataract, is removed. After removal, a clear artificial lens is inserted. This helps to restore your vision, enabling you to see clearly again.

182 services105 patients

Measurement of corneal curvature and depth of eye 92136

This procedure measures the shape and depth of your eye, specifically the cornea, the clear front surface. It helps in diagnosing conditions, planning for surgeries, or fitting contact lenses. It's non-invasive and painless.

141 services105 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

81 services77 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

63 services63 patients

Imaging of retina 92134

Imaging of the retina is a non-invasive procedure that captures detailed images of your eye's interior. This helps detect conditions like macular degeneration or retinal detachment. It's painless and takes only a few minutes.

60 services55 patients

Established patient complete exam of visual system 92014

An established patient complete exam of the visual system involves a thorough check of your eyes and vision. It assesses eye health, checks for diseases, and measures your ability to see clearly at different distances. It's a routine, non-invasive procedure.

46 services42 patients

Removal of recurring cataract in lens capsule using a laser 66821

This procedure, known as YAG laser capsulotomy, treats cloudiness in the lens capsule following cataract surgery. A laser is used to create a small hole in the cloudy capsule, allowing light to pass through and restore clear vision. It's a quick, painless procedure.

40 services40 patients

Removal of cataract with insertion of prosthetic lens 66984

25 services21 patients

Exam of visual field with extended testing 92083

An extended visual field exam is a detailed test to evaluate your peripheral (side) vision. It helps to detect any potential blind spots which may not be noticeable in daily life. These could be caused by eye diseases like glaucoma, or neurological conditions.

20 services15 patients

Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212

This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.

20 services16 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

19 services18 patients

Ultrasound scan of cornea to determine thickness 76514

An ultrasound scan of the cornea is a non-invasive procedure that uses sound waves to measure the thickness of your cornea. This helps in diagnosing certain eye conditions and planning treatments. No discomfort or pain is typically experienced.

17 services17 patients

Exam of the internal drainage system of eye 92020

This is a procedure where your doctor examines the eye's internal drainage system, essential for maintaining eye pressure. They use specialized tools to check for blockages or damage that might lead to conditions like glaucoma. It's non-invasive and painless.

17 services17 patients

Imaging of optic nerve 92133

Imaging of the optic nerve is a non-invasive procedure that captures detailed pictures of your optic nerve. It helps doctors assess eye health, particularly for conditions like glaucoma. It's painless, quick, and uses safe technology like MRI or OCT (Optical Coherence Tomography).

15 services14 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Prairie Lakes Healthcare System, Inc

Acute Care Hospitals · Watertown, SD

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number430005

Location401 9th Avenue NW Post Office Box 1210Watertown, SD 57201 · Codington County

Emergency services Birthing friendly

Avera Mckennan Hospital & University Health Center

Acute Care Hospitals · Sioux Falls, SD

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number430016

Location1325 S Cliff AveSioux Falls, SD 57117 · Minnehaha County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 57108 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$126.78 typical visit price

range $55.52 – $167.23

Typical copayment $31.69 (range $13.88 – $41.80)

Most-billed visit code 99204

Established Patient

$69.20 typical visit price

range $18.08 – $137.08

Typical copayment $17.30 (range $4.52 – $34.27)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 10

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. DAVID R WEST M.D.

Ophthalmology

6601 S MINNESOTA AVE, SUITE 200
SIOUX FALLS, SD 57108

Lincoln County (605) 336-6294

DARWIN G GRAMSTAD CRNA

Nurse Anesthetist, Certified Registered

6601 S MINNESOTA AVE, SUITE 100
SIOUX FALLS, SD 57108

Lincoln County (605) 336-6294

DR. KAREN ELIZABETH DICKES D.O.

Ophthalmology

6601 S MINNESOTA AVE
SIOUX FALLS, SD 57108

Lincoln County (605) 336-6294

ADAM R BLEEKER MD

Ophthalmology

6601 S MINNESOTA AVE
SIOUX FALLS, SD 57108

Lincoln County (605) 336-6294

DR. DUSTIN L DIERKS MD

Ophthalmology

6601 S MINNESOTA AVE, SUITE 200
SIOUX FALLS, SD 57108

Lincoln County (605) 336-6294

DR. ELIZABETH ANNE ATCHISON M.D.

Ophthalmology

6601 S MINNESOTA AVE
SIOUX FALLS, SD 57108

Lincoln County (605) 336-6294

MICHAEL K. EIDE M.D.

Ophthalmology

6601 S MINNESOTA AVE, 200
SIOUX FALLS, SD 57108

Lincoln County (605) 336-6294

DR. BYRON T HOHM M.D.

Ophthalmology

6601 S MINNESOTA AVE, SUITE 200
SIOUX FALLS, SD 57108

Lincoln County (605) 336-6294

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gregory Osmundson's NPI number?

The NPI number for Gregory Osmundson is 1255391801. It was assigned to this individual provider in the NPPES registry on March 27, 2006.

Where is Gregory Osmundson located?

Gregory Osmundson practices at 6601 S Minnesota Ave Suite 200, Sioux Falls, SD 57108. The listed phone number is (605) 336-6294.

What is Gregory Osmundson's specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

Is Gregory Osmundson enrolled in Medicare?

Yes. Gregory Osmundson is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Gregory Osmundson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Osmundson reassigns Medicare benefits to 3 organizations: Ophthalmology Ltd (Sioux Falls, SD), Lac Qui Parle Clinic Of Madison Inc (Madison, MN) and Madison Healthcare Services (Madison, MN). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Gregory Osmundson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Gregory Osmundson accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from NH Healthy Families, Ambetter from Sunflower Health Plan and Avera Health Plans and 3 other insurers list Gregory Osmundson as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Gregory Osmundson affiliated with any hospitals?

According to CMS data, Gregory Osmundson is affiliated with Prairie Lakes Healthcare System, Inc and Avera Mckennan Hospital & University Health Center.

When was this NPI record last updated?

The NPPES record for Gregory Osmundson was last updated on June 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.