NPI registry status
Active
2026 NPPES data Gerontology Nurse Practitioner NPI 1639681000 ARNP
Verify on CMS → Melissa Clark, ARNP
Gerontology Nurse Practitioner in Concord, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 10,056 in Gerontology 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
762
Medicare Part D claims · 213 beneficiaries · Gerontology Nurse Practitioner avg: 1K
Generic prescribing
73%
generic claims · 27% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$528.14
25 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Melissa Clark, ARNP filed 762 Medicare Part D claims in 2024 as a Gerontology Nurse Practitioner in Concord, California, prescribing 73% generic.
- 762
- Part D claims, 2024
- 73%
- generic prescribing
- $528.14
- industry payments (Sunshine Act)
- ≥70th
- pct by Part D claim volume (lower-bound band)
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.
Federal trust snapshot
What official records show about Melissa Clark, ARNP
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1639681000), first enumerated 10/25/2017.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 762 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Hospital affiliations
2 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$528.14 in reported industry payments (25 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Melissa Clark, ARNP's individual license status. Verify directly with the state medical board.
Source: MBC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1639681000 · Gerontology Nurse Practitioner
NPI-10 · ENUM-RECENT · TAX-MID · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1639681000
- ENUM-RECENT 2017
- TAX-MID 10K Gerontology Nurse
- RX-LIGHT 762
- BOOK-LIGHT 557 in California
- PHOTO-ENUM Victoria Noto, NP · 2017
Melissa Clark, ARNP's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
762 ≥ 70th percentile 70% of 1,416,883 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
What does the federal data show about Melissa Clark, ARNP?
Quality data not reportedPrimary specialty
Gerontology Nurse Practitioner
Medicare Part D claims
762 44% vs specialty avg
Specialty distribution in California
How Gerontology Nurse Practitioner compares to other specialties among California 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 Gerontology 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).
Practice Address
Provider Details
| NPI | 1639681000 |
|---|---|
| Specialty | Gerontology Nurse Practitioner |
| Credentials | ARNP |
| Gender | Female |
| NPI Issued | 10/25/2017 |
Hospital and facility affiliations
Facilities where Melissa Clark, ARNP 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.
American Current Care OF California A Medical Corporation
Concord, CA
West Coast Kidney
Walnut Creek, CA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Melissa Clark, ARNP. Source: openpaymentsdata.cms.gov.
Total received
$528
Largest payer
AstraZeneca Pharmaceuticals LP
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Melissa Clark, ARNP. To verify Melissa Clark, ARNP's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Above average
Melissa Clark, ARNP - brand share 27.0%
Gerontology Nurse Practitioner average
27% brand-name claims vs 73% generic, on 762 2024 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 2024.
762
Total Claims
$374K
Total Drug Cost
213
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,857.133
- Total Day Supply
- 55,219
- Brand vs Generic
- 27% brand / 73% generic
- Brand Drug Cost
- $339K
- Generic Drug Cost
- $35K
Patient Demographics
- Average Patient Age
- 72.7 years
- Avg HCC Risk Score
- 5.06
- Gender Split
- 45% female / 55% male
- Age Distribution
- <65: 38, 65-74: 84, 75-84: 54, 85+: 37
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Melissa Clark, ARNP prescribes most
Top Medicare Part D drugs by claim count, 2024
- Sevelamer Carbonate
Sevelamer Carbonate
67 claims
- Lokelma
Lokelma
61 claims
- Farxiga
Farxiga
52 claims
- Carvedilol
Carvedilol
48 claims
- Lisinopril
Lisinopril
47 claims
- Losartan Potassium
Losartan Potassium
44 claims
- Furosemide
Furosemide
29 claims
- Hydralazine Hcl
Hydralazine Hcl
28 claims
| Drug | Claims |
|---|---|
| Sevelamer Carbonate | 67 |
| Lokelma Sodium Zirconium Cyclosilicate | 61 |
| Farxiga Dapagliflozin Propanediol | 52 |
| Carvedilol | 48 |
| Lisinopril | 47 |
| Losartan Potassium | 44 |
| Furosemide | 29 |
| Hydralazine Hcl | 28 |
| Amlodipine Besylate | 26 |
| Jardiance Empagliflozin | 23 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gerontology Nurse Practitioner Overview
How Melissa Clark, ARNP fits within the Gerontology Nurse Practitioner landscape nationally.
10,056
Gerontology Nurse Practitioner Providers in US
54
States with Gerontology Nurse Practitioner
1,350
Avg Claims per Provider
Melissa Clark, ARNP's 762 claims are below the specialty average of 1,350.
Nationwide Gerontology Nurse Practitioner peers with similar MIPS or enrollment year
Two federal-record peer sets for Clark, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2017)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Gerontology Nurse Practitioner Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Clark.
One of 557 Gerontology Nurse Practitioner providers enrolled in California, 5 are shown here.
Abigail Abar-Calica
N.P.
Menlo Park, CA
Michelle Abrams
NP
Thousand Oaks, CA
Roman Emmanuel Acebedo
Carson, CA
Karina Acevedo
AGACNP-BC
Los Angeles, CA
Lisa Adamek
NP
Roseville, CA
Compare Gerontology Nurse Practitioner nationally: see state-by-state distribution →
Frequently Asked Questions
What is Melissa Clark, ARNP's specialty? ▼
Melissa Clark, ARNP specializes in Gerontology Nurse Practitioner and practices in Concord, California. Credentials: ARNP.
How much does Melissa Clark, ARNP prescribe under Medicare Part D? ▼
In 2024, Melissa Clark, ARNP wrote 762 Medicare Part D claims totaling $374K in drug costs for 213 beneficiaries.
Where is Melissa Clark, ARNP located? ▼
Melissa Clark, ARNP is located at 2222 EAST ST STE 305, Concord, CA, 94520. Phone: (925) 686-1230.
What is Melissa Clark, ARNP's NPI number? ▼
Melissa Clark, ARNP's National Provider Identifier (NPI) is 1639681000, issued on 10/25/2017.
Does Melissa Clark, ARNP prescribe more brand-name or generic drugs? ▼
Melissa Clark, ARNP's prescribing is 27% brand-name and 73% generic drugs by claim count, with $339K in brand drug costs.
How many Gerontology Nurse Practitioner providers are there in the US? ▼
There are 10,056 Gerontology Nurse Practitioner providers across 54 states in the US. The average Gerontology Nurse Practitioner provider writes 1,350 Medicare Part D claims per year.
What drugs does Melissa Clark, ARNP prescribe most often? ▼
Based on 2024 Medicare Part D data, Melissa Clark, ARNP's most frequently prescribed drugs include Sevelamer Carbonate, Lokelma, Farxiga. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Melissa Clark, ARNP accept Medicare? ▼
Melissa Clark, ARNP appears in CMS Medicare data with 762 Part D claims and 213 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Melissa Clark, ARNP's credentials? ▼
Melissa Clark, ARNP's NPI is 1639681000 with credentials ARNP. 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 (2024). 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 August 2026 (NPPES) / 2024 (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
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 August 2026.