NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1144399767 MD
Verify on CMS → Carl Berg, MD
Gastroenterology Physician in Durham, North 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 17,061 in Gastroenterology 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
537
Medicare Part D claims · 114 beneficiaries · Gastroenterology Physician avg: 848
What the federal data shows
Carl Berg, MD filed 537 Medicare Part D claims in 2024 as a Gastroenterology Physician in Durham, North Carolina.
- 537
- Part D claims, 2024
- ≥65th
- 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 Carl Berg, MD
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 1144399767), first enumerated 11/07/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 537 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
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- 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 1144399767 · Gastroenterology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1144399767
- ENUM-LEGACY 2006
- TAX-MID 17K Gastroenterology Physician
- RX-LIGHT 537
- BOOK-LIGHT 539 in North Carolina
- PHOTO-ENUM Vanessa Shami · 2006
Carl Berg, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
537 ≥ 65th percentile 65% 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-eligible specialty (heuristic, not verified)
Carl Berg, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Carl Berg, MD?
Quality data not reportedPrimary specialty
Gastroenterology Physician
Medicare Part D claims
537 37% vs specialty avg
Specialty distribution in North Carolina
How Gastroenterology Physician compares to other specialties among North 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 Gastroenterology 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 | 1144399767 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 11/07/2006 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
537
Total Claims
$189K
Total Drug Cost
114
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 989.1
- Total Day Supply
- 29,101
- Generic Drug Cost
- $88K
- Antibiotic Claims
- 21
Patient Demographics
- Average Patient Age
- 67.4 years
- Avg HCC Risk Score
- 2.88
- Gender Split
- 54% female / 46% male
- Age Distribution
- <65: 31, 65-74: 57, 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 Carl Berg, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Tacrolimus
Tacrolimus
121 claims
- Ursodiol 40
Ursodiol
40 claims
- Mycophenolate Mofe… 36
Mycophenolate Mofetil
36 claims
- Spironolactone 27
Spironolactone
27 claims
- Carvedilol 24
Carvedilol
24 claims
- Mycophenolic Acid 24
Mycophenolic Acid
24 claims
- Sirolimus 23
Sirolimus
23 claims
- Prednisone 18
Prednisone
18 claims
| Drug | Claims |
|---|---|
| Tacrolimus | 121 |
| Ursodiol | 40 |
| Mycophenolate Mofetil | 36 |
| Spironolactone | 27 |
| Carvedilol | 24 |
| Mycophenolic Acid Mycophenolate Sodium | 24 |
| Sirolimus | 23 |
| Prednisone | 18 |
| Vemlidy Tenofovir Alafenamide | 16 |
| Xifaxan Rifaximin | 16 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Carl Berg, MD fits within the Gastroenterology Physician landscape nationally.
17,061
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
848
Avg Claims per Provider
Carl Berg, MD's 537 claims are below the specialty average of 848.
Nationwide Gastroenterology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Berg, both outside North Carolina so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Gastroenterology Physician Providers in North Carolina
Other clinicians with the same primary specialty enrolled in North Carolina, drawn from the same CMS NPPES roster as Berg.
One of 539 Gastroenterology Physician providers enrolled in North Carolina, 5 are shown here.
Dr. Manal Abdelmalek
MD
Durham, NC
Dr. Sonia Abichandani
M.D.
Cary, NC
Dr. Sabeen Abid
M.D
Greenville, NC
Dr. Kendral Adkisson
MD
Asheville, NC
Dr. Vipul Aggarwal
M.D.
Winston Salem, NC
Compare Gastroenterology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Carl Berg, MD's specialty? ▼
Carl Berg, MD specializes in Gastroenterology Physician and practices in Durham, North Carolina. Credentials: MD.
How much does Carl Berg, MD prescribe under Medicare Part D? ▼
In 2024, Carl Berg, MD wrote 537 Medicare Part D claims totaling $189K in drug costs for 114 beneficiaries.
Where is Carl Berg, MD located? ▼
Carl Berg, MD is located at 40 DUKE MEDICINE CIR, Durham, NC, 27710. Phone: (919) 684-8111.
What is Carl Berg, MD's NPI number? ▼
Carl Berg, MD's National Provider Identifier (NPI) is 1144399767, issued on 11/07/2006.
How many Gastroenterology Physician providers are there in the US? ▼
There are 17,061 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 848 Medicare Part D claims per year.
What drugs does Carl Berg, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Carl Berg, MD's most frequently prescribed drugs include Tacrolimus, Ursodiol, Mycophenolate Mofetil. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Carl Berg, MD accept Medicare? ▼
Carl Berg, MD appears in CMS Medicare data with 537 Part D claims and 114 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Carl Berg, MD's credentials? ▼
Carl Berg, MD's NPI is 1144399767 with credentials MD. 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.