NPI registry status
Active
2026 NPPES data Neurological Surgery Physician NPI 1821484882 M.D.
Verify on CMS → Charles Opalak, M.D.
Neurological Surgery Physician in Greenville, 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 8,317 in Neurological Surgery 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
305
Medicare Part D claims · 61 beneficiaries · Neurological Surgery Physician avg: 189
Industry payments
$32.93
1 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Charles Opalak, M.D. filed 305 Medicare Part D claims in 2024 as a Neurological Surgery Physician in Greenville, South Carolina.
- 305
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥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 Charles Opalak, M.D.
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 1821484882), first enumerated 04/07/2015.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 305 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
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$32.93 in reported industry payments (1 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- 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 1821484882 · Neurological Surgery Physician
NPI-10 · ENUM-MID · TAX-MID · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1821484882
- ENUM-MID 2015
- TAX-MID 8K Neurological Surgery
- RX-LIGHT 305
- BOOK-THIN 125 in South Carolina
- PHOTO-ENUM Mariam Salisu · 2015
Charles Opalak, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
305 ≥ 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
✓
Board certification likely (heuristic, not verified)
Charles Opalak, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - 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 Charles Opalak, M.D.?
Quality data not reportedPrimary specialty
Neurological Surgery Physician
Medicare Part D claims
305 61% vs specialty avg
Specialty distribution in South Carolina
How Neurological Surgery 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 Neurological Surgery 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 | 1821484882 |
|---|---|
| Specialty | Neurological Surgery Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 04/07/2015 |
Hospital and facility affiliations
Facilities where Charles Opalak, M.D. 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.
Prisma Health University Medical Group
Greenville, 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).
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 Charles Opalak, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$33
Largest payer
Providence Medical Technology, Inc.
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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
305
Total Claims
$2K
Total Drug Cost
61
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 321.5
- Total Day Supply
- 4,260
- Generic Drug Cost
- $2K
- Opioid Claims
- 144 (47.2% rate)
Patient Demographics
- Average Patient Age
- 67.6 years
- Avg HCC Risk Score
- 1.59
- Gender Split
- 61% female / 39% male
- Age Distribution
- <65: 15, 65-74: 30, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Charles Opalak, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Oxycodone Hcl
Oxycodone Hcl
102 claims
- Diazepam 33
Diazepam
33 claims
- Hydrocodone-Acetam… 25
Hydrocodone-Acetaminophen
25 claims
- Methocarbamol 25
Methocarbamol
25 claims
- Gabapentin 21
Gabapentin
21 claims
- Tizanidine Hcl 21
Tizanidine Hcl
21 claims
- Tramadol Hcl 12
Tramadol Hcl
12 claims
- Pregabalin 11
Pregabalin
11 claims
| Drug | Claims |
|---|---|
| Oxycodone Hcl | 102 |
| Diazepam | 33 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 25 |
| Methocarbamol | 25 |
| Gabapentin | 21 |
| Tizanidine Hcl | 21 |
| Tramadol Hcl | 12 |
| Pregabalin | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Neurological Surgery Physician Overview
How Charles Opalak, M.D. fits within the Neurological Surgery Physician landscape nationally.
8,317
Neurological Surgery Physician Providers in US
53
States with Neurological Surgery Physician
189
Avg Claims per Provider
Charles Opalak, M.D.'s 305 claims are above the specialty average of 189.
Nationwide Neurological Surgery Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Opalak, 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 Neurological Surgery Physician Providers in South Carolina
Other clinicians with the same primary specialty enrolled in South Carolina, drawn from the same CMS NPPES roster as Opalak.
One of 125 Neurological Surgery Physician providers enrolled in South Carolina, 5 are shown here.
Jeremy Adkins
Spartanburg, SC
Dr. Mohammed Alshareef
M.D.
Charleston, SC
Dr. Thomas Anderson
MD
Mt Pleasant, SC
Dr. Samuel Asante
M.D
Greenville, SC
Dr. Anthony Asher
MD
Columbia, SC
Compare Neurological Surgery Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Charles Opalak, M.D.'s specialty? ▼
Charles Opalak, M.D. specializes in Neurological Surgery Physician and practices in Greenville, South Carolina. Credentials: M.D..
How much does Charles Opalak, M.D. prescribe under Medicare Part D? ▼
In 2024, Charles Opalak, M.D. wrote 305 Medicare Part D claims totaling $2K in drug costs for 61 beneficiaries.
Where is Charles Opalak, M.D. located? ▼
Charles Opalak, M.D. is located at 111 DOCTORS DR, Greenville, SC, 29605. Phone: (864) 797-7150.
What is Charles Opalak, M.D.'s NPI number? ▼
Charles Opalak, M.D.'s National Provider Identifier (NPI) is 1821484882, issued on 04/07/2015.
Does Charles Opalak, M.D. prescribe opioids? ▼
Yes, Charles Opalak, M.D. had 144 opioid claims in 2024 with an opioid prescribing rate of 47.2%.
How many Neurological Surgery Physician providers are there in the US? ▼
There are 8,317 Neurological Surgery Physician providers across 53 states in the US. The average Neurological Surgery Physician provider writes 189 Medicare Part D claims per year.
What drugs does Charles Opalak, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Charles Opalak, M.D.'s most frequently prescribed drugs include Oxycodone Hcl, Diazepam, Hydrocodone-Acetaminophen. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Charles Opalak, M.D. accept Medicare? ▼
Charles Opalak, M.D. appears in CMS Medicare data with 305 Part D claims and 61 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Charles Opalak, M.D.'s credentials? ▼
Charles Opalak, M.D.'s NPI is 1821484882 with credentials M.D.. 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.