Byron L. Marshall, NP-C
Family Nurse Practitioner · Portland, ME
Byron L. Marshall, NP-C is a family nurse practitioner with a practice address in Portland, Maine, and NPI 1780819110, issued on May 29, 2009. Check the license (Maine CNP171130, as entered in NPPES) with the Maine board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Byron L. Marshall
- Credential
- NP-C
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License numbers
- CNP171130 ME
R056280 ME
Self-reported in NPPES; status is on the state search - Practice location
- 22 Bramhall St, Portland, ME 04102
- Phone
- (207) 662-2911
- Enumerated
- May 29, 2009
- Record last updated
- Jun 18, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (207) 662-6006
- Medicare enrollment
- Enrolled (PECOS I20171128002833); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 1,274 in Maine → Look up another NPI →
Also registered at 22 Bramhall St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Byron L. Marshall in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maine board licenses this profession
Search for license CNP171130Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average family nurse practitioner in 2024
12 Medicare Part D claims, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 98.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- MainehealthPortland, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Byron L. Marshall among 1,274 family nurse practitioner records in Maine
Byron L. Marshall, NP-C is one of 1,274 family nurse practitioner records with a practice address in Maine. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 27% of them.
- NPI issued2009 · 27% of these records are older, 71% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated2017 · median 2018 among the 811 with a school on file
- Record last updated2021 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Maine practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
135 family nurse practitioner records list a practice address in Portland
They are 135 of the 6,022 NPPES records with a practice address in Portland, and 1,274 family nurse practitioner records in Maine.
All 1,274 in Maine → Every provider in Portland → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Deirdre Bennett, NP, CNMPortland, ME 041021952318339
- Kelly Daly, APRN, FNP-CPortland, ME 041021013019348
- Chelsea Dugan, FNPPortland, ME 041021215976931
- Philip Gage, NPPortland, ME 041021861585036
- Michelle Guinta, MSN FNP-CPortland, ME 041021962473215
- Leslie Henry, FNPPortland, ME 041021518998707
- Stacey Kelley, FNP-CPortland, ME 041021033188263
- Dawne Miller, FNP-CPortland, ME 041021447239025
Common questions
What is Byron L. Marshall, NP-C's NPI number?
Byron L. Marshall, NP-C's National Provider Identifier (NPI) is 1780819110, issued on May 29, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Byron L. Marshall, NP-C located?
The NPPES record lists a practice address at 22 Bramhall St, Portland, ME, 04102. Phone: (207) 662-2911. Providers update this record themselves, so call before visiting.
How can I verify Byron L. Marshall, NP-C's license?
NPPES lists Maine license number CNP171130, as entered by the provider. Search the Maine board that licenses this profession; the NPPES record confirms identity only.
How much does Byron L. Marshall, NP-C prescribe under Medicare Part D?
In 2024, Byron L. Marshall, NP-C had 12 Medicare Part D claims; the average among family nurse practitioner prescribers was 1,305. Part D covers Medicare prescriptions only.
What is Byron L. Marshall, NP-C's MIPS final score?
The 2023 MIPS final score is 98.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.