2026 NPPES data Internal Medicine Physician NPI 1639336845 M.D.
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Helen West, M.D.

Internal Medicine Physician in Chapel Hill, 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 172,858 in Internal 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
3K
Medicare Part D claims · 239 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
85%
generic claims · 14% brand-name · higher generic rates reduce patient out-of-pocket costs
Compiled from official public sources by the PlainDoctor editorial team.

What the federal data shows

Helen West, M.D. filed 2,865 Medicare Part D claims in 2023 as a Internal Medicine Physician in Chapel Hill, North Carolina, prescribing 85% generic.

3K
Part D claims, 2023
85%
generic prescribing
Likely
board-certified (heuristic)

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.

Helen West, M.D.'s Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

2,865 Top 12% higher than 88% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). Below this entry. 400–600: 90,619 prescribers (7%). Below this entry. 600–800: 56,224 prescribers (4%). Below this entry. 800–1,000: 40,919 prescribers (3%). Below this entry. 1,000–1,200: 31,827 prescribers (2%). Below this entry. 1,200–1,400: 26,224 prescribers (2%). Below this entry. 1,400–1,600: 21,710 prescribers (2%). Below this entry. 1,600–1,800: 19,072 prescribers (1%). Below this entry. 1,800–2,000: 16,451 prescribers (1%). Below this entry. 2,000–2,200: 213,991 prescribers (16%). This entry sits in this band. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

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.

Source CMS Medicare Part D Prescriber Public Use File · 2023

Board certification likely (heuristic — not verified)

Helen West, M.D. 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 Helen West, M.D.?

Quality data not reported

NPI registry status

Active

Issued 05/16/2008

NPI 1639336845

Primary specialty

Internal Medicine Physician

High-volume

172,858 US NPIs in this specialty

Medicare Part D claims

2,865 5% vs specialty avg

2023 prescription claims

Specialty avg: 2,716

Specialty distribution in North Carolina

How Internal Medicine Physician compares to other specialties among North Carolina providers

North Carolina providers

Largest specialties in North Carolina (% of in-state providers)

Clinical Social Worker — 7.1%Clinical Social Worker7.1%Behavior Technician — 6.4%Behavior Technician6.4%Pharmacist — 5%Pharmacist5%Student in an Organized Health Care Education/Training Program — 4.5%Student in an Organized Health Care Education/Training Program4.5%Physical Therapist — 4.3%Physical Therapist4.3%Physician Assistant — 4.2%Physician Assistant4.2%Internal Medicine Physician — 2.5%Internal Medicine Physician2.5%
Largest specialties in North Carolina (% of in-state providers)

Specialty board-certification context

Estimated specialty board-certified rate — Internal Medicine Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Internal Medicine Physician ABMS/AOA estimate

Est. board-certified rate (Internal Medicine Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Internal Medicine Physician) — ABMS / AOA estimate

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).

Helen West, M.D. appears in the CMS NPPES registry as a Internal Medicine Physician provider holding M.D. credentials at 5034 OLD CLINIC BUILDING CB 7110, Chapel Hill, NC, 27599, with a listed phone of (919) 966-2276. NPI 1639336845 was issued on 05/16/2008. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what West most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 2,865 prescription claims written by this provider, covering 239 Medicare beneficiaries and totaling roughly $384K in drug spend, split 14% brand-name and 85% generic by claim count, with an opioid prescribing rate of 1.6%. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Internal Medicine Physician is a high-volume specialty nationwide, with 172,858 enrolled providers across 56 states and an average of 2,716 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline. Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist — always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.

Practice Address

5034 OLD CLINIC BUILDING CB 7110
Chapel Hill, NC 27599

Provider Details

NPI 1639336845
Specialty Internal Medicine Physician
Credentials M.D.
Gender Female
NPI Issued 05/16/2008

Hospital and facility affiliations

Facilities where Helen West, 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.

Legacy Healthcare Services Inc
Durham, NC
University OF North Carolina AT Chapel Hill
Chapel Hill, NC

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

Helen West, M.D. — brand share 14.0%
Internal Medicine Physician average

14% brand-name claims vs 85% generic, on 2,865 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.

2,865
Total Claims
$384K
Total Drug Cost
239
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
6,807
Total Day Supply
200,238
Brand vs Generic
14% brand / 85% generic
Brand Drug Cost
$312K
Generic Drug Cost
$71K
Opioid Claims
46 (1.6% rate)
Antibiotic Claims
28

Patient Demographics

Average Patient Age
71.2 years
Avg HCC Risk Score
1.40
Gender Split
66% female / 34% male
Age Distribution
<65: 35, 65-74: 113, 75-84: 76, 85+: 15

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What Helen West, M.D. prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Atorvastatin Calcium
153
Amlodipine Besylate
106
Omeprazole
79
Levothyroxine Sodium
75
Lisinopril
65
Losartan Potassium
61
Metoprolol Succinate
61
Gabapentin
60
Rosuvastatin Calcium
60
Alendronate Sodium
55

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Internal Medicine Physician Overview

How Helen West, M.D. fits within the Internal Medicine Physician landscape nationally.

172,858
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider

Helen West, M.D.'s 2,865 claims are above the specialty average of 2,716.

Nearby Internal Medicine Physician Providers in North Carolina

Other clinicians with the same primary specialty enrolled in North Carolina, drawn from the same CMS NPPES roster as West.

Compare Internal Medicine Physician nationally: see state-by-state distribution →

Before you book an appointment

Use this federal record as your verification checklist, not as a recommendation.

  • Confirm the NPI record is current in the official CMS registry — providers update their own NPPES details, and moves can lag. Verify this NPI
  • Check the active license and any disciplinary history with the North Carolina medical board — federal registration is not a license check. Credential verification guide
  • Weigh a second option: compare this provider with a nearby Internal Medicine Physician peer on Medicare volume and prescribing patterns. Compare providers

Medicare Part D and MIPS figures describe practice patterns in federal programs only — they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.

Frequently Asked Questions

What is Helen West, M.D.'s specialty?
Helen West, M.D. specializes in Internal Medicine Physician and practices in Chapel Hill, North Carolina. Credentials: M.D..
How much does Helen West, M.D. prescribe under Medicare Part D?
In 2023, Helen West, M.D. wrote 2,865 Medicare Part D claims totaling $384K in drug costs for 239 beneficiaries.
Where is Helen West, M.D. located?
Helen West, M.D. is located at 5034 OLD CLINIC BUILDING CB 7110, Chapel Hill, NC, 27599. Phone: (919) 966-2276.
What is Helen West, M.D.'s NPI number?
Helen West, M.D.'s National Provider Identifier (NPI) is 1639336845, issued on 05/16/2008.
Does Helen West, M.D. prescribe more brand-name or generic drugs?
Helen West, M.D.'s prescribing is 14% brand-name and 85% generic drugs by claim count, with $312K in brand drug costs.
Does Helen West, M.D. prescribe opioids?
Yes, Helen West, M.D. had 46 opioid claims in 2023 with an opioid prescribing rate of 1.6%.
How many Internal Medicine Physician providers are there in the US?
There are 172,858 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Helen West, M.D. prescribe most often?
Based on 2023 Medicare Part D data, Helen West, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Omeprazole. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Helen West, M.D. accept Medicare?
Helen West, M.D. appears in CMS Medicare data with 2,865 Part D claims and 239 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Helen West, M.D.'s credentials?
Helen West, M.D.'s NPI is 1639336845 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

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

Compiled from official public sources by the PlainDoctor editorial team.