2026 NPPES data Optometrist NPI 1588720031 O.D.
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JAMES CHESLOCK, O.D.

Optometrist in NORTH BEND, Oregon. 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
183
Medicare Part D claims · 41 beneficiaries · Optometrist avg: 257
Generic prescribing
58%
generic claims · 42% brand-name · higher generic rates reduce patient out-of-pocket costs
What the federal data reveals: JAMES CHESLOCK, O.D. is a Optometrist ([object Object]) practicing in NORTH BEND, Oregon with a Medicare Part D prescribing footprint of 183 claims across 41 beneficiaries — 42% brand-name prescribing .

What stands out: JAMES CHESLOCK, O.D. filed 183 Medicare Part D claims in 2023 across NORTH BEND, Oregon. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

JAMES CHESLOCK, O.D. at a glance

Quality data not reported

NPI registry status

Active

Issued 12/29/2006

NPI 1588720031

Primary specialty

Optometrist

High-volume

60,463 US NPIs in this specialty

Medicare Part D claims

183 29% vs specialty avg

2023 prescription claims

Specialty avg: 257

Specialty distribution in Oregon

How Optometrist compares to other specialties among Oregon providers

Oregon providers

Optometrist share within Oregon

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

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).

JAMES CHESLOCK, O.D. is a Optometrist provider practicing in NORTH BEND, Oregon, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: O.D.. NPI: 1588720031. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

JAMES CHESLOCK, O.D. appears in the CMS NPPES registry as a Optometrist provider holding O.D. credentials at 1817 MEADE ST, NORTH BEND, OR, 97459, with a listed phone of (541) 756-2727. NPI 1588720031 was issued on 12/29/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what CHESLOCK 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 183 prescription claims written by this provider, covering 41 Medicare beneficiaries and totaling roughly $3K in drug spend, split 42% brand-name and 58% 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

1817 MEADE ST
NORTH BEND, OR 97459

Provider Details

NPI 1588720031
Specialty Optometrist
Credentials O.D.
Gender Male
NPI Issued 12/29/2006

Brand vs generic prescribing mix · Above average

JAMES CHESLOCK, O.D. — brand share 42.0%
Specialty average (est.)

42% brand-name claims vs 58% generic, on 183 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.

183
Total Claims
$3K
Total Drug Cost
41
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
264
Total Day Supply
7,141
Brand vs Generic
42% brand / 58% generic
Brand Drug Cost
$1K
Generic Drug Cost
$2K

Patient Demographics

Average Patient Age
71.0 years
Avg HCC Risk Score
1.04
Gender Split
59% female / 41% male

Top Prescribed Drugs (Medicare Part D)

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

Drug Claims
Latanoprost
124
Timolol Maleate
33

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

Optometrist Overview

How JAMES CHESLOCK, O.D. fits within the Optometrist landscape nationally.

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

JAMES CHESLOCK, O.D.'s 183 claims are below the specialty average of 257.

Nearby Optometrist Providers in Oregon

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

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

Frequently Asked Questions

What is JAMES CHESLOCK, O.D.'s specialty?
JAMES CHESLOCK, O.D. specializes in Optometrist and practices in NORTH BEND, Oregon. Credentials: O.D..
How much does JAMES CHESLOCK, O.D. prescribe under Medicare Part D?
In 2023, JAMES CHESLOCK, O.D. wrote 183 Medicare Part D claims totaling $3K in drug costs for 41 beneficiaries.
Where is JAMES CHESLOCK, O.D. located?
JAMES CHESLOCK, O.D. is located at 1817 MEADE ST, NORTH BEND, OR, 97459. Phone: (541) 756-2727.
What is JAMES CHESLOCK, O.D.'s NPI number?
JAMES CHESLOCK, O.D.'s National Provider Identifier (NPI) is 1588720031, issued on 12/29/2006.
Does JAMES CHESLOCK, O.D. prescribe more brand-name or generic drugs?
JAMES CHESLOCK, O.D.'s prescribing is 42% brand-name and 58% generic drugs by claim count, with $1K 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 JAMES CHESLOCK, O.D. prescribe most often?
Based on 2023 Medicare Part D data, JAMES CHESLOCK, O.D.'s most frequently prescribed drugs include Latanoprost, Timolol Maleate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does JAMES CHESLOCK, O.D. accept Medicare?
JAMES CHESLOCK, O.D. appears in CMS Medicare data with 183 Part D claims and 41 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify JAMES CHESLOCK, O.D.'s credentials?
JAMES CHESLOCK, O.D.'s NPI is 1588720031 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