GREGORY ALAN CHRISTIANSEN M.D.
NPI 1831175629
Ophthalmology in Salt Lake City, UT

Q: What is Gregory Christiansen's NPI number?

The NPI number for Gregory Christiansen is 1831175629. It was assigned to this individual provider in the NPPES registry on December 22, 2005.

Q: What is Gregory Christiansen's specialty?

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

Active since December 22, 2005PECOS EnrolledAccepts Medicare Assignment

6344 S 900 E, SALT LAKE CITY, UT 84121(801) 892-8222(801) 904-3436 Get Directions Write a Review

NPPES record last updated: February 25, 2015. Verified against the NPPES registry weekly; last sync: November 01, 2026.

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About Gregory Alan Christiansen M.d. NPPES

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

GREGORY ALAN CHRISTIANSEN M.D. (NPI 1831175629) is an individual ophthalmology provider in Salt Lake City, Utah, licensed in Oregon (LL15827) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS, is affiliated with Unitypoint Health - Marshalltown, and is a graduate of University Of Utah School Of Medicine (2000).

NPPES Registry Identity

NPI1831175629

Entity TypeIndividualMale

Primary Taxonomy207W00000X

Provider Legal NameGREGORY ALAN CHRISTIANSENCredential: M.D.

Location Address6344 S 900 ESalt Lake City, UT 84121-2439

Mailing Address6344 S 900 ESalt Lake City, UT 84121-2439 · (801) 892-8222 · Fax (801) 904-3436

Phone(801) 892-8222

Fax(801) 904-3436

Sole ProprietorNo

Medical School CMSUniversity Of Utah School Of MedicineGraduated 2000

Enumeration DateDecember 22, 2005

Last NPPES UpdateFebruary 25, 2015

✔ NPI 1831175629 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOphthalmologyAllopathic & Osteopathic Physicians

Taxonomy Code207W00000X

License✔ Licensed in OR · LL15827

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.

6344 S 900 E, Salt Lake City, UT 84121

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Other Identifiers 3

Medicaid028061OR

Medicare PIN000.69345UT

Medicare UPINR137671

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

Gregory Alan Christiansen 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 ID5193793685

PECOS Enrollment IDI20220524002556

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 Reassignment

Medicare enrollment records show Gregory Christiansen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Wolfe Clinic Inc

989 mi

Ophthalmology

309 E CHURCH ST
Marshalltown, IA 50158

Reassigned Medicare billing, Iowa enrollment
39 clinicians in this Medicare group

NPI 1477532174 (641) 754-6200

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 25

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.

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.

1,164 services861 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.

1,156 services938 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).

1,069 services926 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.

678 services532 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.

549 services187 patients

Injection, bimatoprost, intracameral implant, 1 microgram J7351

This procedure involves placing a tiny implant inside the eye, which releases a drug called bimatoprost. This drug helps to lower high pressure in the eye, typically seen in conditions like glaucoma. It's a safe and effective treatment.

492 services41 patients

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.

481 services189 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.

170 services170 patients

Laser repair to improve eye fluid flow 65855

Laser repair to improve eye fluid flow is a procedure aimed at treating glaucoma. A laser is used to create a small hole in the eye's drainage system, allowing fluid to flow out more easily. This helps to lower the pressure inside the eye, reducing the risk of vision loss.

91 services89 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.

79 services78 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.

78 services78 patients

Ultrasound scan to determine eye length and lens power 76519

An ultrasound scan for the eye is a safe, non-invasive procedure. It uses sound waves to create images of your eye's structure. This helps determine the length of your eye and the power of your lens, which is crucial for diagnosing eye conditions and planning surgeries.

72 services24 patients

Injection of medication into eye 66030

This procedure involves administering medication directly into your eye. A tiny needle is used to deliver the drug into the vitreous, a jelly-like substance in the eye. It helps treat conditions like macular degeneration or diabetic retinopathy. It's generally safe and effective.

70 services41 patients

Complex removal of cataract with insertion of prosthetic lens 66982

This procedure involves removing a cloudy lens (cataract) from your eye and replacing it with a clear, artificial lens. It helps restore vision that has been affected by the cataract. The operation is usually done under local anesthesia.

70 services30 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.

48 services47 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.

45 services45 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.

42 services41 patients

Incision to improve eye fluid flow 65820

This procedure, known as a trabeculectomy, involves creating a small opening in the eye to improve fluid flow. This can help lower eye pressure in conditions like glaucoma. It's a common, safe procedure to protect your eye health.

34 services23 patients

Ct scan of cornea 92025

A CT scan of the cornea is a non-invasive imaging test that uses X-rays to capture detailed pictures of your eye's cornea. It helps in diagnosing diseases or damage, planning for surgery, or evaluating the results of a treatment. It's a safe and painless procedure.

26 services26 patients

New patient complete exam of visual system 92004

A new patient complete exam of the visual system is a thorough evaluation of your eyes and vision. It checks for any potential issues and assesses overall eye health. It includes tests for visual acuity, eye movement, and light response.

22 services22 patients

Insertion of eye fluid drainage device 66183

The insertion of an eye fluid drainage device is a procedure to manage eye pressure. A small device is placed in the eye to help drain excess fluid, reducing pressure that can damage the optic nerve and lead to vision loss. This procedure is often used for glaucoma treatment.

18 services17 patients

Established patient problem focused exam of visual system 92012

This is a routine check-up for existing patients focusing on the visual system. It involves examining your eyes to detect any potential issues or changes in your vision. It's a crucial part of maintaining good eye health.

18 services18 patients

Insertion of needle into vein for collection of blood sample 36415

This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.

17 services17 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.

17 services17 patients

Creation of shunt to improve eye fluid flow using tissue graft 66180

This procedure involves creating a new pathway for fluid to flow out of your eye using a tissue graft. It helps to lower eye pressure and prevent damage to your optic nerve, improving eye health and vision.

14 services14 patients

Hospital Affiliations CMS Care Compare

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

Unitypoint Health - Marshalltown

Acute Care Hospitals · Marshalltown, IA

OwnershipVoluntary non-profit - Private

CMS Certification Number160001

Location55 Unitypoint WayMarshalltown, IA 50158 · Marshall County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 84121 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

$125.70 typical visit price

range $54.34 – $166.03

Typical copayment $31.42 (range $13.58 – $41.50)

Most-billed visit code 99204

Established Patient

$68.01 typical visit price

range $17.23 – $135.20

Typical copayment $17.00 (range $4.30 – $33.80)

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 4

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

GLAUKOM LLC

Ophthalmology

6344 S 900 E
SALT LAKE CITY, UT 84121

Salt Lake County (801) 892-8222

ROXBURY INSTITUTE SALT LAKE CITY PLLC

Clinic/Center (Medical Specialty)

6344 S 900 E
MURRAY, UT 84121

Salt Lake County (918) 851-3715

ROXBURY INSTITUTE SLC SURGICAL CENTER LLC

Clinic/Center (Ambulatory Surgical)

6344 S 900 E
MURRAY, UT 84121

Salt Lake County (918) 851-3715

MICHAEL T CHISM OPTOMETRY STUDENT

Student in an Organized Health Care Education/Training Program

6344 S 900 E
MURRAY, UT 84121

Salt Lake County (801) 892-8222

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 Christiansen's NPI number?

The NPI number for Gregory Christiansen is 1831175629. It was assigned to this individual provider in the NPPES registry on December 22, 2005.

Where is Gregory Christiansen located?

Gregory Christiansen practices at 6344 S 900 E, Salt Lake City, UT 84121. The listed phone number is (801) 892-8222.

What is Gregory Christiansen's specialty?

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

Is Gregory Christiansen enrolled in Medicare?

Yes. Gregory Christiansen 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 organization bills Medicare for Gregory Christiansen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Christiansen reassigns Medicare benefits to Wolfe Clinic Inc (Marshalltown, IA). The 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 Christiansen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Gregory Christiansen accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from NH Healthy Families, Ambetter from Sunflower Health Plan and Oscar Health and 3 other insurers list Gregory Christiansen 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 Christiansen affiliated with any hospitals?

According to CMS data, Gregory Christiansen is affiliated with Unitypoint Health - Marshalltown.

When was this NPI record last updated?

The NPPES record for Gregory Christiansen was last updated on February 25, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 years 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.