NPI registry status
Active
2026 NPPES data Nurse Practitioner NPI 1356658462 NP
Verify on CMS → Catherine Grams, NP
Nurse Practitioner in Portland, Maine.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 87,700 in Nurse Practitioner, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
80
Medicare Part D claims · 49 beneficiaries · Nurse Practitioner avg: 1K
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Catherine Grams, NP filed 80 Medicare Part D claims in 2023 as a Nurse Practitioner in Portland, Maine.
- 80
- Part D claims, 2023
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.
Catherine Grams, NP's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
80 0th percentile higher than 0% of 1,370,886 prescribers
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 Catherine Grams, NP?
Quality data not reportedPrimary specialty
Nurse Practitioner
Medicare Part D claims
80 93% vs specialty avg
Specialty distribution in Maine
How Nurse Practitioner compares to other specialties among Maine providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Nurse Practitioner. Verify directly:
How MIPS and board certification work
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).
Catherine Grams, NP appears in the CMS NPPES registry as a Nurse Practitioner provider holding NP credentials at 22 BRAMHALL ST, Portland, ME, 04102, with a listed phone of (207) 662-2526. NPI 1356658462 was issued on 09/10/2010.
Medicare Part D records for calendar year 2023 show 80 prescription claims written by this provider, covering 49 Medicare beneficiaries and totaling roughly $8K in drug spend, with an opioid prescribing rate of 38.8%.
Nurse Practitioner is a high-volume specialty nationwide, with 87,700 enrolled providers across 56 states and an average of 1,084 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
Provider Details
| NPI | 1356658462 |
|---|---|
| Specialty | Nurse Practitioner |
| Credentials | NP |
| Gender | Female |
| NPI Issued | 09/10/2010 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
80
Total Claims
$8K
Total Drug Cost
49
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 89
- Total Day Supply
- 1,092
- Generic Drug Cost
- $434
- Opioid Claims
- 31 (38.8% rate)
- Antibiotic Claims
- 20
Patient Demographics
- Average Patient Age
- 71.7 years
- Avg HCC Risk Score
- 1.54
- Gender Split
- 41% female / 59% 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 | 26 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nurse Practitioner Overview
How Catherine Grams, NP fits within the Nurse Practitioner landscape nationally.
87,700
Nurse Practitioner Providers in US
56
States with Nurse Practitioner
1,084
Avg Claims per Provider
Catherine Grams, NP's 80 claims are below the specialty average of 1,084.
Nearby Nurse Practitioner Providers in Maine
Other clinicians with the same primary specialty enrolled in Maine, drawn from the same CMS NPPES roster as Grams.
Dr. Carmen Ackerson
APRN
Augusta, ME
Dr. Chrystal Adams
FNP
Bangor, ME
Dr. Georgina Aguirre
NP
Presque Isle, ME
Dr. Deana Albert
N.P.
Lewiston, ME
Dr. Steven Albert
FNP
Van Buren, ME
Compare Nurse Practitioner nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Maine medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Nurse Practitioner peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Maine
Frequently Asked Questions
What is Catherine Grams, NP's specialty? ▼
Catherine Grams, NP specializes in Nurse Practitioner and practices in Portland, Maine. Credentials: NP.
How much does Catherine Grams, NP prescribe under Medicare Part D? ▼
In 2023, Catherine Grams, NP wrote 80 Medicare Part D claims totaling $8K in drug costs for 49 beneficiaries.
Where is Catherine Grams, NP located? ▼
Catherine Grams, NP is located at 22 BRAMHALL ST, Portland, ME, 04102. Phone: (207) 662-2526.
What is Catherine Grams, NP's NPI number? ▼
Catherine Grams, NP's National Provider Identifier (NPI) is 1356658462, issued on 09/10/2010.
Does Catherine Grams, NP prescribe opioids? ▼
Yes, Catherine Grams, NP had 31 opioid claims in 2023 with an opioid prescribing rate of 38.8%.
How many Nurse Practitioner providers are there in the US? ▼
There are 87,700 Nurse Practitioner providers across 56 states in the US. The average Nurse Practitioner provider writes 1,084 Medicare Part D claims per year.
What drugs does Catherine Grams, NP prescribe most often? ▼
Based on 2023 Medicare Part D data, Catherine Grams, NP's most frequently prescribed drugs include Oxycodone Hcl, Amoxicillin-Clavulanate Potass. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Catherine Grams, NP accept Medicare? ▼
Catherine Grams, NP appears in CMS Medicare data with 80 Part D claims and 49 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Catherine Grams, NP's credentials? ▼
Catherine Grams, NP's NPI is 1356658462 with credentials NP. 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
View source datasets and methodology notes
- 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
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.