NPI registry status
Active
2026 NPPES data Undersea and Hyperbaric Medicine (Preventive Medicine) Physician NPI 1578944476 D.O.
Verify on CMS → Ann Passini, D.O.
Undersea and Hyperbaric Medicine (Preventive Medicine) Physician in Charleston, South Carolina.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 243 in Undersea and Hyperbaric Medicine (Preventive Medicine) Physician, 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
4K
Medicare Part D claims · 314 beneficiaries · Undersea and Hyperbaric Medicine (Preventive Medicine) Physician avg: 522
Generic prescribing
87%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Ann Passini, D.O. filed 4,303 Medicare Part D claims in 2023 as an Undersea and Hyperbaric Medicine (Preventive Medicine) Physician in Charleston, South Carolina, prescribing 87% generic.
- 4K
- Part D claims, 2023
- 87%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥92nd
- 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 Ann Passini, D.O.
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 1578944476), first enumerated 06/16/2015.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 4,303 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
2 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- 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 1578944476 · Undersea and Hyperbaric Medicine (Preventive Medicine) Physician
NPI-10 · ENUM-MID · TAX-TRACE · RX-MID · BOOK-THIN · PHOTO-ENUM
- NPI-10 1578944476
- ENUM-MID 2015
- TAX-TRACE 243
- RX-MID 4,303
- BOOK-THIN 5 in South Carolina
- PHOTO-ENUM Mahmoud Sabha · 2015
Ann Passini, D.O.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
4,303 ≥ 92nd percentile 92% of 1,370,886 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 · 2023
✓
Board certification likely (heuristic, not verified)
Ann Passini, D.O. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Ann Passini, D.O.?
Quality data not reportedPrimary specialty
Undersea and Hyperbaric Medicine (Preventive Medicine) Physician
Medicare Part D claims
4,303 8× vs specialty avg
Specialty distribution in South Carolina
How Undersea and Hyperbaric Medicine (Preventive Medicine) Physician compares to other specialties among South Carolina 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 Undersea and Hyperbaric Medicine (Preventive Medicine) Physician. 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 | 1578944476 |
|---|---|
| Specialty | Undersea and Hyperbaric Medicine (Preventive Medicine) Physician |
| Credentials | D.O. |
| Gender | Female |
| NPI Issued | 06/16/2015 |
Hospital and facility affiliations
Facilities where Ann Passini, D.O. 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.
Genesis Health System
Davenport, IA
Roper St Francis Hospital-Berkeley Inc.
Summerville, SC
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Typical
Ann Passini, D.O. - brand share 12.0%
Undersea and Hyperbaric Medicine (Preventive Medicine) Physician average
12% brand-name claims vs 87% generic, on 4,303 2023 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 2023.
4,303
Total Claims
$328K
Total Drug Cost
314
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 9,925
- Total Day Supply
- 290,433
- Brand vs Generic
- 12% brand / 87% generic
- Brand Drug Cost
- $261K
- Generic Drug Cost
- $63K
- Opioid Claims
- 34 (0.8% rate)
- Antibiotic Claims
- 74
Patient Demographics
- Average Patient Age
- 74.4 years
- Avg HCC Risk Score
- 1.09
- Gender Split
- 72% female / 28% male
- Age Distribution
- <65: 19, 65-74: 140, 75-84: 126, 85+: 29
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Ann Passini, D.O. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
427 claims
- Amlodipine Besylate
Amlodipine Besylate
275 claims
- Levothyroxine Sodium
Levothyroxine Sodium
263 claims
- Lisinopril
Lisinopril
178 claims
- Hydrochlorothiazide 135
Hydrochlorothiazide
135 claims
- Metoprolol Succinate 135
Metoprolol Succinate
135 claims
- Omeprazole 125
Omeprazole
125 claims
- Losartan Potassium 122
Losartan Potassium
122 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 427 |
| Amlodipine Besylate | 275 |
| Levothyroxine Sodium | 263 |
| Lisinopril | 178 |
| Hydrochlorothiazide | 135 |
| Metoprolol Succinate | 135 |
| Omeprazole | 125 |
| Losartan Potassium | 122 |
| Simvastatin | 117 |
| Gabapentin | 87 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Undersea and Hyperbaric Medicine (Preventive Medicine) Physician in SC →
All providers in South Carolina →
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Undersea and Hyperbaric Medicine (Preventive Medicine) Physician Overview
How Ann Passini, D.O. fits within the Undersea and Hyperbaric Medicine (Preventive Medicine) Physician landscape nationally.
243
Undersea and Hyperbaric Medicine (Preventive Medicine) Physician Providers in US
42
States with Undersea and Hyperbaric Medicine (Preventive Medicine) Physician
522
Avg Claims per Provider
Ann Passini, D.O.'s 4,303 claims are above the specialty average of 522.
Nationwide Undersea and Hyperbaric Medicine (Preventive Medicine) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Passini, both outside South Carolina so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2015)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Undersea and Hyperbaric Medicine (Preventive Medicine) Physician Providers in South Carolina
Other clinicians with the same primary specialty enrolled in South Carolina, drawn from the same CMS NPPES roster as Passini.
One of 5 Undersea and Hyperbaric Medicine (Preventive Medicine) Physician providers enrolled in South Carolina, 4 are shown here.
Frequently Asked Questions
What is Ann Passini, D.O.'s specialty? ▼
Ann Passini, D.O. specializes in Undersea and Hyperbaric Medicine (Preventive Medicine) Physician and practices in Charleston, South Carolina. Credentials: D.O..
How much does Ann Passini, D.O. prescribe under Medicare Part D? ▼
In 2023, Ann Passini, D.O. wrote 4,303 Medicare Part D claims totaling $328K in drug costs for 314 beneficiaries.
Where is Ann Passini, D.O. located? ▼
Ann Passini, D.O. is located at 316 CALHOUN ST, Charleston, SC, 29401. Phone: (843) 724-2289.
What is Ann Passini, D.O.'s NPI number? ▼
Ann Passini, D.O.'s National Provider Identifier (NPI) is 1578944476, issued on 06/16/2015.
Does Ann Passini, D.O. prescribe more brand-name or generic drugs? ▼
Ann Passini, D.O.'s prescribing is 12% brand-name and 87% generic drugs by claim count, with $261K in brand drug costs.
Does Ann Passini, D.O. prescribe opioids? ▼
Yes, Ann Passini, D.O. had 34 opioid claims in 2023 with an opioid prescribing rate of 0.8%.
How many Undersea and Hyperbaric Medicine (Preventive Medicine) Physician providers are there in the US? ▼
There are 243 Undersea and Hyperbaric Medicine (Preventive Medicine) Physician providers across 42 states in the US. The average Undersea and Hyperbaric Medicine (Preventive Medicine) Physician provider writes 522 Medicare Part D claims per year.
What drugs does Ann Passini, D.O. prescribe most often? ▼
Based on 2023 Medicare Part D data, Ann Passini, D.O.'s most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Levothyroxine Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ann Passini, D.O. accept Medicare? ▼
Ann Passini, D.O. appears in CMS Medicare data with 4,303 Part D claims and 314 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ann Passini, D.O.'s credentials? ▼
Ann Passini, D.O.'s NPI is 1578944476 with credentials D.O.. 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
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.