2026 NPPES data Optometrist NPI 1689645764 O.D.
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MARK TURK, O.D.

Optometrist in BOAZ, Alabama. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
319
Medicare Part D claims · 91 beneficiaries · Optometrist avg: 257
Generic prescribing
47%
generic claims · 53% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$54.73
1 payments · CMS Open Payments (Sunshine Act)

What the federal data shows

MARK TURK, O.D. filed 319 Medicare Part D claims in 2023 as a Optometrist in BOAZ, Alabama, prescribing 47% generic.

319
Part D claims, 2023
47%
generic prescribing
$54.73
industry payments (Sunshine Act)

Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) — no proprietary rating or editorial opinion is applied.

MARK TURK, O.D.'s Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

319 Top 43% higher than 57% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). This entry sits in this band. 400–600: 90,619 prescribers (7%). Above this entry. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source CMS Medicare Part D Prescriber Public Use File · 2023

What does the federal data show about MARK TURK, O.D.?

Quality data not reported

NPI registry status

Active

Issued 01/27/2006

NPI 1689645764

Primary specialty

Optometrist

High-volume

60,463 US NPIs in this specialty

Medicare Part D claims

319 24% vs specialty avg

2023 prescription claims

Specialty avg: 257

Specialty distribution in Alabama

How Optometrist compares to other specialties among Alabama providers

Alabama providers

Optometrist share within Alabama

1. Optometrist42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Optometrist share within Alabama

Specialty board-certification context

Estimated specialty board-certified rate — Optometrist (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Optometrist ABMS/AOA estimate

Est. board-certified rate (Optometrist) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Optometrist) — ABMS / AOA estimate

The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.

Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).

MARK TURK, O.D. appears in the CMS NPPES registry as a Optometrist provider holding O.D. credentials at 2378 US HIGHWAY 431, BOAZ, AL, 35957, with a listed phone of (256) 593-4141. NPI 1689645764 was issued on 01/27/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what TURK most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 319 prescription claims written by this provider, covering 91 Medicare beneficiaries and totaling roughly $78K in drug spend, split 53% brand-name and 47% generic by claim count. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Optometrist is a high-volume specialty nationwide, with 60,463 enrolled providers across 56 states and an average of 257 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline. Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist — always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.

Practice Address

2378 US HIGHWAY 431
BOAZ, AL 35957

Provider Details

NPI 1689645764
Specialty Optometrist
Credentials O.D.
Gender Male
NPI Issued 01/27/2006

Industry payments received (2024) — CMS Open Payments transparency data

The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for MARK TURK, O.D.. Source: openpaymentsdata.cms.gov.

Total received

$55

Largest payer

Carl Zeiss Meditec USA, Inc.

Most common payment type

Food and Beverage

Industry payments are not necessarily indicators of bias — they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.

Brand vs generic prescribing mix · Brand-heavy

MARK TURK, O.D. — brand share 53.0%
Specialty average (est.)

53% brand-name claims vs 47% generic, on 319 2023 Medicare Part D claims.

The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

319
Total Claims
$78K
Total Drug Cost
91
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
608
Total Day Supply
17,523
Brand vs Generic
53% brand / 47% generic
Brand Drug Cost
$67K
Generic Drug Cost
$12K

Patient Demographics

Average Patient Age
75.7 years
Avg HCC Risk Score
1.08
Gender Split
69% female / 31% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What MARK TURK, O.D. prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Latanoprost
106
Timolol Maleate
40
Lumigan
Bimatoprost
35
Restasis
Cyclosporine
19
Brimonidine Tartrate
18
Dorzolamide-Timolol
Dorzolamide Hcl/Timolol Maleat
18
Xiidra
Lifitegrast
18
Cyclosporine
16

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Optometrist Overview

How MARK TURK, O.D. fits within the Optometrist landscape nationally.

60,463
Optometrist Providers in US
56
States with Optometrist
257
Avg Claims per Provider

MARK TURK, O.D.'s 319 claims are above the specialty average of 257.

Nearby Optometrist Providers in Alabama

Other clinicians with the same primary specialty enrolled in Alabama, drawn from the same CMS NPPES roster as TURK.

Compare Optometrist nationally: see state-by-state distribution →

Frequently Asked Questions

What is MARK TURK, O.D.'s specialty?
MARK TURK, O.D. specializes in Optometrist and practices in BOAZ, Alabama. Credentials: O.D..
How much does MARK TURK, O.D. prescribe under Medicare Part D?
In 2023, MARK TURK, O.D. wrote 319 Medicare Part D claims totaling $78K in drug costs for 91 beneficiaries.
Where is MARK TURK, O.D. located?
MARK TURK, O.D. is located at 2378 US HIGHWAY 431, BOAZ, AL, 35957. Phone: (256) 593-4141.
What is MARK TURK, O.D.'s NPI number?
MARK TURK, O.D.'s National Provider Identifier (NPI) is 1689645764, issued on 01/27/2006.
Does MARK TURK, O.D. prescribe more brand-name or generic drugs?
MARK TURK, O.D.'s prescribing is 53% brand-name and 47% generic drugs by claim count, with $67K in brand drug costs.
How many Optometrist providers are there in the US?
There are 60,463 Optometrist providers across 56 states in the US. The average Optometrist provider writes 257 Medicare Part D claims per year.
What drugs does MARK TURK, O.D. prescribe most often?
Based on 2023 Medicare Part D data, MARK TURK, O.D.'s most frequently prescribed drugs include Latanoprost, Timolol Maleate, Lumigan. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does MARK TURK, O.D. accept Medicare?
MARK TURK, O.D. appears in CMS Medicare data with 319 Part D claims and 91 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify MARK TURK, O.D.'s credentials?
MARK TURK, O.D.'s NPI is 1689645764 with credentials O.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.

Data Sources

Provider Directory
CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
Specialty Classification
NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
Prescribing Data
CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
Limitations
Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.

See our complete data methodology for details on how we collect and process government data.

Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).

Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology