2026 NPPES data Family Medicine Physician NPI 1558353896 MD
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GREGORY GLASS, MD

Family Medicine Physician in MOUNT HOLLY, North Carolina. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
2K
Medicare Part D claims · 251 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
87%
generic claims · 13% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$203.31
11 payments · CMS Open Payments (Sunshine Act)

What the federal data shows

GREGORY GLASS, MD filed 1,925 Medicare Part D claims in 2023 as a Family Medicine Physician in MOUNT HOLLY, North Carolina, prescribing 87% generic.

2K
Part D claims, 2023
87%
generic prescribing
$203.31
industry payments (Sunshine Act)

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.

GREGORY GLASS, MD's Medicare Part D volume vs every U.S. prescriber

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

1,925 Top 16% higher than 84% 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%). This entry sits in this band. 2,000–2,200: 213,991 prescribers (16%). Above this entry. 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-eligible specialty (heuristic — not verified)

GREGORY GLASS, 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 GREGORY GLASS, MD?

Quality data not reported

NPI registry status

Active

Issued 08/22/2005

NPI 1558353896

Primary specialty

Family Medicine Physician

High-volume

147,640 US NPIs in this specialty

Medicare Part D claims

1,925 44% vs specialty avg

2023 prescription claims

Specialty avg: 3,418

Specialty distribution in North Carolina

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

North Carolina providers

Family Medicine Physician share within North Carolina

1. Family Medicine Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Family Medicine Physician share within North Carolina

Specialty board-certification context

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

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

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

0%100%78%
Est. board-certified rate (Family 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).

GREGORY GLASS, MD appears in the CMS NPPES registry as a Family Medicine Physician provider holding MD credentials at 125 W CATAWBA AVE, MOUNT HOLLY, NC, 28120, with a listed phone of (704) 827-3014. NPI 1558353896 was issued on 08/22/2005. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what GLASS 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 1,925 prescription claims written by this provider, covering 251 Medicare beneficiaries and totaling roughly $121K in drug spend, split 13% brand-name and 87% generic by claim count, with an opioid prescribing rate of 6.8%. 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.

Family Medicine Physician is a high-volume specialty nationwide, with 147,640 enrolled providers across 56 states and an average of 3,418 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

125 W CATAWBA AVE
MOUNT HOLLY, NC 28120

Provider Details

NPI 1558353896
Specialty Family Medicine Physician
Credentials MD
Gender Male
NPI Issued 08/22/2005

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 GREGORY GLASS, MD. Source: openpaymentsdata.cms.gov.

Total received

$203

Largest payer

ABBVIE 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.

Brand vs generic prescribing mix · Typical

GREGORY GLASS, MD — brand share 13.0%
Specialty average (est.)

13% brand-name claims vs 87% generic, on 1,925 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.

1,925
Total Claims
$121K
Total Drug Cost
251
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
3,277
Total Day Supply
96,220
Brand vs Generic
13% brand / 87% generic
Brand Drug Cost
$92K
Generic Drug Cost
$28K
Opioid Claims
131 (6.8% rate)
Antibiotic Claims
20

Patient Demographics

Average Patient Age
71.6 years
Avg HCC Risk Score
1.34
Gender Split
56% female / 44% male
Age Distribution
<65: 45, 65-74: 111, 75-84: 76, 85+: 19

Top Prescribed Drugs (Medicare Part D)

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

What GREGORY GLASS, MD 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
Alprazolam
140
Levothyroxine Sodium
90
Atorvastatin Calcium
66
Omeprazole
64
Hydrochlorothiazide
52
Metformin Hcl
52
Tramadol Hcl
52
Amlodipine Besylate
51
Lisinopril
45
Metoprolol Succinate
44

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

Family Medicine Physician Overview

How GREGORY GLASS, MD fits within the Family Medicine Physician landscape nationally.

147,640
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider

GREGORY GLASS, MD's 1,925 claims are below the specialty average of 3,418.

Nearby Family 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 GLASS.

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

Frequently Asked Questions

What is GREGORY GLASS, MD's specialty?
GREGORY GLASS, MD specializes in Family Medicine Physician and practices in MOUNT HOLLY, North Carolina. Credentials: MD.
How much does GREGORY GLASS, MD prescribe under Medicare Part D?
In 2023, GREGORY GLASS, MD wrote 1,925 Medicare Part D claims totaling $121K in drug costs for 251 beneficiaries.
Where is GREGORY GLASS, MD located?
GREGORY GLASS, MD is located at 125 W CATAWBA AVE, MOUNT HOLLY, NC, 28120. Phone: (704) 827-3014.
What is GREGORY GLASS, MD's NPI number?
GREGORY GLASS, MD's National Provider Identifier (NPI) is 1558353896, issued on 08/22/2005.
Does GREGORY GLASS, MD prescribe more brand-name or generic drugs?
GREGORY GLASS, MD's prescribing is 13% brand-name and 87% generic drugs by claim count, with $92K in brand drug costs.
Does GREGORY GLASS, MD prescribe opioids?
Yes, GREGORY GLASS, MD had 131 opioid claims in 2023 with an opioid prescribing rate of 6.8%.
How many Family Medicine Physician providers are there in the US?
There are 147,640 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
What drugs does GREGORY GLASS, MD prescribe most often?
Based on 2023 Medicare Part D data, GREGORY GLASS, MD's most frequently prescribed drugs include Alprazolam, Levothyroxine Sodium, Atorvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does GREGORY GLASS, MD accept Medicare?
GREGORY GLASS, MD appears in CMS Medicare data with 1,925 Part D claims and 251 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify GREGORY GLASS, MD's credentials?
GREGORY GLASS, MD's NPI is 1558353896 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

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