2026 NPPES data Colon & Rectal Surgery Physician NPI 1558476101 M.D.
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DAVID PARSONS, M.D.

Colon & Rectal Surgery Physician in CLACKAMAS, 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
185
Medicare Part D claims · 78 beneficiaries · Colon & Rectal Surgery Physician avg: 196
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
What the federal data reveals: DAVID PARSONS, M.D. is a Colon & Rectal Surgery Physician ([object Object]) practicing in CLACKAMAS, Oregon with a Medicare Part D prescribing footprint of 185 claims across 78 beneficiaries — 9% brand-name prescribing .

What stands out: DAVID PARSONS, M.D. filed 185 Medicare Part D claims in 2023 across CLACKAMAS, Oregon. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

DAVID PARSONS, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation — signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

DAVID PARSONS, M.D. at a glance

Quality data not reported

NPI registry status

Active

Issued 08/21/2006

NPI 1558476101

Primary specialty

Colon & Rectal Surgery Physician

Niche

1,608 US NPIs in this specialty

Medicare Part D claims

185 6% vs specialty avg

2023 prescription claims

Specialty avg: 196

Specialty distribution in Oregon

How Colon & Rectal Surgery Physician compares to other specialties among Oregon providers

Oregon providers

Colon & Rectal Surgery Physician share within Oregon

1. Colon & Rectal Surgery Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Colon & Rectal Surgery Physician share within Oregon

Specialty board-certification context

Estimated specialty board-certified rate — Colon & Rectal Surgery Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Colon & Rectal Surgery Physician ABMS/AOA estimate

Est. board-certified rate (Colon & Rectal Surgery Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Colon & Rectal Surgery Physician) — 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).

DAVID PARSONS, M.D. is a Colon & Rectal Surgery Physician provider practicing in CLACKAMAS, Oregon, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: M.D.. NPI: 1558476101. 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.

DAVID PARSONS, M.D. appears in the CMS NPPES registry as a Colon & Rectal Surgery Physician provider holding M.D. credentials at 10100 SE SUNNYSIDE RD, CLACKAMAS, OR, 97015, with a listed phone of (503) 786-8435. NPI 1558476101 was issued on 08/21/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what PARSONS 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 185 prescription claims written by this provider, covering 78 Medicare beneficiaries and totaling roughly $14K in drug spend, split 9% brand-name and 91% generic by claim count, with an opioid prescribing rate of 21.6%. 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.

Colon & Rectal Surgery Physician is a narrow specialty nationwide, with 1,608 enrolled providers across 50 states and an average of 196 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

10100 SE SUNNYSIDE RD
CLACKAMAS, OR 97015

Provider Details

NPI 1558476101
Specialty Colon & Rectal Surgery Physician
Credentials M.D.
Gender Male
NPI Issued 08/21/2006

Hospital and facility affiliations

Facilities where DAVID PARSONS, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" — a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.

KAISER FOUNDATION HEALTH PLAN OF THE NORTHWEST
CLACKAMAS, OR

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

Brand vs generic prescribing mix · Generic-heavy

DAVID PARSONS, M.D. — brand share 9.0%
Specialty average (est.)

9% brand-name claims vs 91% generic, on 185 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.

185
Total Claims
$14K
Total Drug Cost
78
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
211
Total Day Supply
2,638
Brand vs Generic
9% brand / 91% generic
Brand Drug Cost
$11K
Generic Drug Cost
$3K
Opioid Claims
40 (21.6% rate)
Antibiotic Claims
44

Patient Demographics

Average Patient Age
73.9 years
Avg HCC Risk Score
1.24
Gender Split
65% female / 35% 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
Oxycodone Hcl
37
Metronidazole
20
Prochlorperazine Maleate
20
Neomycin Sulfate
14
Methocarbamol
11
Gavilyte-C
"Peg3350/Sod Sulf
N/A

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

Colon & Rectal Surgery Physician Overview

How DAVID PARSONS, M.D. fits within the Colon & Rectal Surgery Physician landscape nationally.

1,608
Colon & Rectal Surgery Physician Providers in US
50
States with Colon & Rectal Surgery Physician
196
Avg Claims per Provider

DAVID PARSONS, M.D.'s 185 claims are below the specialty average of 196.

Nearby Colon & Rectal Surgery Physician Providers in Oregon

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

Compare Colon & Rectal Surgery Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is DAVID PARSONS, M.D.'s specialty?
DAVID PARSONS, M.D. specializes in Colon & Rectal Surgery Physician and practices in CLACKAMAS, Oregon. Credentials: M.D..
How much does DAVID PARSONS, M.D. prescribe under Medicare Part D?
In 2023, DAVID PARSONS, M.D. wrote 185 Medicare Part D claims totaling $14K in drug costs for 78 beneficiaries.
Where is DAVID PARSONS, M.D. located?
DAVID PARSONS, M.D. is located at 10100 SE SUNNYSIDE RD, CLACKAMAS, OR, 97015. Phone: (503) 786-8435.
What is DAVID PARSONS, M.D.'s NPI number?
DAVID PARSONS, M.D.'s National Provider Identifier (NPI) is 1558476101, issued on 08/21/2006.
Does DAVID PARSONS, M.D. prescribe more brand-name or generic drugs?
DAVID PARSONS, M.D.'s prescribing is 9% brand-name and 91% generic drugs by claim count, with $11K in brand drug costs.
Does DAVID PARSONS, M.D. prescribe opioids?
Yes, DAVID PARSONS, M.D. had 40 opioid claims in 2023 with an opioid prescribing rate of 21.6%.
How many Colon & Rectal Surgery Physician providers are there in the US?
There are 1,608 Colon & Rectal Surgery Physician providers across 50 states in the US. The average Colon & Rectal Surgery Physician provider writes 196 Medicare Part D claims per year.
What drugs does DAVID PARSONS, M.D. prescribe most often?
Based on 2023 Medicare Part D data, DAVID PARSONS, M.D.'s most frequently prescribed drugs include Oxycodone Hcl, Metronidazole, Prochlorperazine Maleate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does DAVID PARSONS, M.D. accept Medicare?
DAVID PARSONS, M.D. appears in CMS Medicare data with 185 Part D claims and 78 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify DAVID PARSONS, M.D.'s credentials?
DAVID PARSONS, M.D.'s NPI is 1558476101 with credentials M.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