DIEM T. NGUYEN O.D.
NPI 1669554812
Optometrist in Easley, SC

Q: What is Diem Nguyen's NPI number?

The NPI number for Diem Nguyen is 1669554812. It was assigned to this individual provider in the NPPES registry on October 19, 2006.

Q: What is Diem Nguyen's specialty?

The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.

Q: When was this NPI record last updated?

The NPPES record for Diem Nguyen was last updated on September 22, 2025. NPI Profile syncs with the weekly NPPES data releases published by CMS.

Active since October 19, 2006PECOS EnrolledAccepts Medicare Assignment

220 S PENDLETON ST, EASLEY, SC 29640(864) 859-3233(864) 850-4001 Get Directions Write a Review

NPPES record last updated: September 22, 2025. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Sep 8, 2023, Feb 4, 2022 (2 updates tracked since 2022).

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About Diem T. Nguyen O.d. NPPES

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

DIEM T. NGUYEN O.D. (NPI 1669554812) is an individual optometrist in Easley, South Carolina, licensed in South Carolina (2301) and active in the NPI registry since October 2006. She is enrolled in Medicare PECOS, maintains a secondary practice location in Greenville, and is a graduate of New England College Of Optometry (2002).

NPPES Registry Identity

NPI1669554812

Entity TypeIndividualFemale

Primary Taxonomy152W00000X

Provider Legal NameDIEM T. NGUYENCredential: O.D.

Location Address220 S PENDLETON STEasley, SC 29640-3048

Mailing Address601 Halton RdGreenville, SC 29607-3403 · (864) 458-7956 · Fax (864) 458-8390

Phone(864) 859-3233

Fax(864) 850-4001

Sole ProprietorNo

Medical School CMSNew England College Of OptometryGraduated 2002

Enumeration DateOctober 19, 2006

Last NPPES UpdateSeptember 22, 20252 updates tracked since enumeration

NPPES CertifiedSeptember 22, 2025

✔ NPI 1669554812 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOptometristEye and Vision Services Providers

Taxonomy Code152W00000X

Licenses✔ Licensed in SC · 2301✔ Licensed in VA · 0618-001238

Definition

Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.

220 S PENDLETON ST, Easley, SC 29640

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Secondary Practice Location 1

Location 1601 Halton RdGreenville, SC 29607-3403 · Phone (864) 458-7956 · Fax (864) 458-8390

Other Identifiers 2

MedicaidD23017SC

Other2301SC · Sc License

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Louisiana, Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Diem T. Nguyen O.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 ID8820016595

PECOS Enrollment IDI20220110000942

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.

Areas of Expertise CMS Part B claims 11

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 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.

354 services335 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.

98 services98 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.

94 services86 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.

81 services73 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).

79 services75 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.

76 services60 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 29640 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

$124.04 typical visit price

range $53.57 – $163.84

Typical copayment $31.01 (range $13.39 – $40.96)

Most-billed visit code 99204

Established Patient

$67.12 typical visit price

range $16.96 – $133.52

Typical copayment $16.78 (range $4.24 – $33.38)

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.

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Other Providers at the Same Location NPPES 5

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

JOSEPH J ZINKOVICH O.D.

Optometrist