NPI registry status
Active
2026 NPPES data Medical Physician Assistant NPI 1982113007 PA-C
Verify on CMS → Melissa Nastacio, PA-C
Medical Physician Assistant in San Francisco, 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 40,694 in Medical Physician Assistant, 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
309
Medicare Part D claims · 208 beneficiaries · Medical Physician Assistant avg: 1K
What the federal data shows
Melissa Nastacio, PA-C filed 309 Medicare Part D claims in 2024 as a Medical Physician Assistant in San Francisco, California.
- 309
- Part D claims, 2024
- ≥56th
- 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 Nastacio, PA-C
Bare NPI registry listing — limited federal enrichment beyond basic enumeration. Verify all credentials with official sources.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1982113007), first enumerated 09/20/2017.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 309 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Melissa Nastacio, PA-C'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 1982113007 · Medical Physician Assistant
NPI-10 · ENUM-RECENT · TAX-MID · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1982113007
- ENUM-RECENT 2017
- TAX-MID 41K Medical Physician
- RX-LIGHT 309
- BOOK-LIGHT 3,489 in California
- PHOTO-ENUM Colleen Chatman, PA-C · 2017
Melissa Nastacio, PA-C's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
309 ≥ 56th percentile 56% 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 Nastacio, PA-C?
Quality data not reportedPrimary specialty
Medical Physician Assistant
Medicare Part D claims
309 73% vs specialty avg
Specialty distribution in California
How Medical Physician Assistant 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 Medical Physician Assistant. 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 | 1982113007 |
|---|---|
| Specialty | Medical Physician Assistant |
| Credentials | PA-C |
| Gender | Female |
| NPI Issued | 09/20/2017 |
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 Nastacio, PA-C. To verify Melissa Nastacio, PA-C'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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
309
Total Claims
$18K
Total Drug Cost
208
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 716.633
- Total Day Supply
- 20,238
- Generic Drug Cost
- $4K
- Antibiotic Claims
- 17
Patient Demographics
- Average Patient Age
- 72.8 years
- Avg HCC Risk Score
- 1.01
- Gender Split
- 65% female / 35% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Melissa Nastacio, PA-C prescribes most
Top Medicare Part D drugs by claim count, 2024
- Atorvastatin Calcium
Atorvastatin Calcium
23 claims
- Lisinopril
Lisinopril
22 claims
- Amlodipine Besylate
Amlodipine Besylate
17 claims
- Simvastatin
Simvastatin
13 claims
- Levothyroxine Sodium
Levothyroxine Sodium
11 claims
- Losartan Potassium
Losartan Potassium
11 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 23 |
| Lisinopril | 22 |
| Amlodipine Besylate | 17 |
| Simvastatin | 13 |
| Levothyroxine Sodium | 11 |
| Losartan Potassium | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Medical Physician Assistant Overview
How Melissa Nastacio, PA-C fits within the Medical Physician Assistant landscape nationally.
40,694
Medical Physician Assistant Providers in US
55
States with Medical Physician Assistant
1,139
Avg Claims per Provider
Melissa Nastacio, PA-C's 309 claims are below the specialty average of 1,139.
Nationwide Medical Physician Assistant peers with similar MIPS or enrollment year
Two federal-record peer sets for Nastacio, 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 Medical Physician Assistant Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Nastacio.
One of 3,489 Medical Physician Assistant providers enrolled in California, 5 are shown here.
Bridget Abajian
PA-C
Los Angeles, CA
Crispin Abbott
PHYSICIAN ASSISTANT
Thousand Oaks, CA
Abdol Hamid Abdali Hajiabadi
P.A.
Santa Ana, CA
Jilbert Abnoosian
PA
Lynwood, CA
Reema Aboelrish
PA-C
Fresno, CA
Compare Medical Physician Assistant nationally: see state-by-state distribution →
Frequently Asked Questions
What is Melissa Nastacio, PA-C's specialty? ▼
Melissa Nastacio, PA-C specializes in Medical Physician Assistant and practices in San Francisco, California. Credentials: PA-C.
How much does Melissa Nastacio, PA-C prescribe under Medicare Part D? ▼
In 2024, Melissa Nastacio, PA-C wrote 309 Medicare Part D claims totaling $18K in drug costs for 208 beneficiaries.
Where is Melissa Nastacio, PA-C located? ▼
Melissa Nastacio, PA-C is located at 2 EMBARCADERO CTR LBBY LEVEL, San Francisco, CA, 94111. Phone: (888) 663-6331.
What is Melissa Nastacio, PA-C's NPI number? ▼
Melissa Nastacio, PA-C's National Provider Identifier (NPI) is 1982113007, issued on 09/20/2017.
How many Medical Physician Assistant providers are there in the US? ▼
There are 40,694 Medical Physician Assistant providers across 55 states in the US. The average Medical Physician Assistant provider writes 1,139 Medicare Part D claims per year.
What drugs does Melissa Nastacio, PA-C prescribe most often? ▼
Based on 2024 Medicare Part D data, Melissa Nastacio, PA-C's most frequently prescribed drugs include Atorvastatin Calcium, Lisinopril, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Melissa Nastacio, PA-C accept Medicare? ▼
Melissa Nastacio, PA-C appears in CMS Medicare data with 309 Part D claims and 208 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Melissa Nastacio, PA-C's credentials? ▼
Melissa Nastacio, PA-C's NPI is 1982113007 with credentials PA-C. 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.