NPPES file of Aug 9, 2026

Cassandra O'Connor, FNP-BC

Family Nurse Practitioner · Portland, ME

Cassandra O'Connor, FNP-BC is a family nurse practitioner with a practice address in Portland, Maine, and NPI 1316719594, issued on Oct 23, 2023. Check the license (Maine CNP231582, as entered in NPPES) with the Maine board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1316719594
Name
Cassandra O'Connor
Credential
FNP-BC
Primary taxonomy
Family Nurse Practitioner 363LF0000X
License number
CNP231582 ME
Self-reported in NPPES; status is on the state search
Practice location
191 Marginal Way, Portland, ME 04101
Phone
(207) 517-3838
Enumerated
Oct 23, 2023
Record last updated
Nov 17, 2023
Fax
(207) 517-3820
Medicare enrollment
Enrolled (PECOS I20231115000524); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest family nurse practitioner records → All 1,274 in Maine → Look up another NPI →

Also registered at 191 Marginal Way

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Brittany Allen, FNP-BCFamily Nurse Practitioner1841718277
  2. Emily BoedekerFamily Nurse Practitioner1407657943
  3. Jessica Byron, APRNNurse Practitioner1235725938
  4. Camilla Horton, PA-CPhysician Assistant1598443939
  5. Rachel Matusko, FNP-CFamily Nurse Practitioner1477249837
  6. Riley McKeown, PA-CPhysician Assistant1598414443

Verify Cassandra O'Connor in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Maine board licenses this profession
    Search for license CNP231582    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Maine license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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87% fewer Medicare Part D claims than the average family nurse practitioner in 2024

173 Medicare Part D claims for 134 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.

  1. Cassandra O'Connor173
  2. Specialty average1,305

Most prescribed

  1. Amoxicillin-Clavulanate Potass20 claims
  2. Cephalexin19 claims
  3. Doxycycline Monohydrate16 claims
  4. Prednisone13 claims
  5. Amoxicillin12 claims
  6. Albuterol Sulfate Hfa11 claims

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.

Industry payments in 2024: $14.03

1 payment: food and beverage; the largest payer was Pfizer Inc. The 99,489 providers of this specialty with any payment received $650.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Cassandra O'Connor$14.03
  2. Specialty average$650.95

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Convenientmd - Ffs UC LLCPortland, ME

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Cassandra O'Connor among 1,274 family nurse practitioner records in Maine

Cassandra O'Connor, FNP-BC 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 2023, is newer than 84% of them.

  • NPI issued2023 · 84% of these records are older, 11% newer
  • In a Medicare fileYes · 77% of these records are
  • In the CMS Doctors and Clinicians fileYes · 64% of these records are
  • Graduated2022 · median 2018 among the 811 with a school on file
  • Record last updated2023 · 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

  1. Kathleen Brown, ANPPortland, ME 041011114020179
  2. Stephanie Chin, FNP-BC, APRN-CNPPortland, ME 041011447303961
  3. Melanie Connors, FNPPortland, ME 041011497881833
  4. Kristen Ellensohn, APRN FNPPortland, ME 041011689618563
  5. Carol Freshley, FNPPortland, ME 041011043652779
  6. Katherine Gilbert, FNPPortland, ME 041011154390847
  7. Dale Harrison, FNPPortland, ME 041011467574772
  8. Amy Hinshaw, FNPPortland, ME 041011659616159

Common questions

What is Cassandra O'Connor, FNP-BC's NPI number?

Cassandra O'Connor, FNP-BC's National Provider Identifier (NPI) is 1316719594, issued on Oct 23, 2023. An NPI identifies a provider in billing; it is not a license.

Where is Cassandra O'Connor, FNP-BC located?

The NPPES record lists a practice address at 191 Marginal Way, Portland, ME, 04101. Phone: (207) 517-3838. Providers update this record themselves, so call before visiting.

How can I verify Cassandra O'Connor, FNP-BC's license?

NPPES lists Maine license number CNP231582, as entered by the provider. Search the Maine board that licenses this profession; the NPPES record confirms identity only.

How much does Cassandra O'Connor, FNP-BC prescribe under Medicare Part D?

In 2024, Cassandra O'Connor, FNP-BC had 173 Medicare Part D claims for 134 beneficiaries; the average among family nurse practitioner prescribers was 1,305. Part D covers Medicare prescriptions only.

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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.