NPI registry status
Active
2026 NPPES data Pulmonary Disease Physician NPI 1972570141 M.D.
Verify on CMS → Lydia Chang, M.D.
Pulmonary Disease 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 9,271 in Pulmonary Disease 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
226
Medicare Part D claims · 72 beneficiaries · Pulmonary Disease Physician avg: 1K
Generic prescribing
59%
generic claims · 41% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Lydia Chang, M.D. filed 226 Medicare Part D claims in 2023 as a Pulmonary Disease Physician in Chapel Hill, North Carolina, prescribing 59% generic.
- 226
- Part D claims, 2023
- 59%
- 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.
Lydia Chang, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
226 49th percentile higher than 49% of 1,370,886 prescribers
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)
Lydia Chang, 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 Lydia Chang, M.D.?
Quality data not reportedPrimary specialty
Pulmonary Disease Physician
Medicare Part D claims
226 84% vs specialty avg
Specialty distribution in North Carolina
How Pulmonary Disease 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 Pulmonary Disease 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).
Lydia Chang, M.D. appears in the CMS NPPES registry as a Pulmonary Disease Physician provider holding M.D. credentials at 130 MASON FARM RD, Chapel Hill, NC, 27599, with a listed phone of (919) 966-2531. NPI 1972570141 was issued on 03/07/2006.
Medicare Part D records for calendar year 2023 show 226 prescription claims written by this provider, covering 72 Medicare beneficiaries and totaling roughly $54K in drug spend, split 41% brand-name and 59% generic by claim count.
Pulmonary Disease Physician is a mid-sized specialty nationwide, with 9,271 enrolled providers across 53 states and an average of 1,457 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
Provider Details
| NPI | 1972570141 |
|---|---|
| Specialty | Pulmonary Disease Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 03/07/2006 |
Hospital and facility affiliations
Facilities where Lydia Chang, 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.
Mission Health Community Multispecialty Providers LLC
Asheville, 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 · Above average
Lydia Chang, M.D. - brand share 41.0%
Pulmonary Disease Physician average
41% brand-name claims vs 59% generic, on 226 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.
226
Total Claims
$54K
Total Drug Cost
72
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 274
- Total Day Supply
- 7,231
- Brand vs Generic
- 41% brand / 59% generic
- Brand Drug Cost
- $51K
- Generic Drug Cost
- $3K
- Antibiotic Claims
- 49
Patient Demographics
- Average Patient Age
- 74.0 years
- Avg HCC Risk Score
- 1.54
- Gender Split
- 61% female / 39% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Lydia Chang, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Azithromycin
Azithromycin
26 claims
- Trelegy Ellipta
Trelegy Ellipta
22 claims
- Albuterol Sulfate …
Albuterol Sulfate Hfa
19 claims
- Montelukast Sodium
Montelukast Sodium
19 claims
- Breo Ellipta
Breo Ellipta
17 claims
- Prednisone
Prednisone
17 claims
- Breztri Aerosphere
Breztri Aerosphere
11 claims
| Drug | Claims |
|---|---|
| Azithromycin | 26 |
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 22 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 19 |
| Montelukast Sodium | 19 |
| Breo Ellipta Fluticasone/Vilanterol | 17 |
| Prednisone | 17 |
| Breztri Aerosphere Budesonide/Glycopyr/Formoterol | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Pulmonary Disease Physician Overview
How Lydia Chang, M.D. fits within the Pulmonary Disease Physician landscape nationally.
9,271
Pulmonary Disease Physician Providers in US
53
States with Pulmonary Disease Physician
1,457
Avg Claims per Provider
Lydia Chang, M.D.'s 226 claims are below the specialty average of 1,457.
Nearby Pulmonary Disease Physician Providers in North Carolina
Other clinicians with the same primary specialty enrolled in North Carolina, drawn from the same CMS NPPES roster as Chang.
Dr. Mariam Abboud
MD
Raleigh, NC
Dr. Chandar Abboy
M.D.
Fayetteville, NC
Dr. Norman Adair
MD
Winston Salem, NC
Dr. Farhan Ahmed
M.D.
Winston Salem, NC
Dr. Rohit Ahuja
MD
Raleigh, NC
Compare Pulmonary Disease 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 Pulmonary Disease 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.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore North Carolina
Frequently Asked Questions
What is Lydia Chang, M.D.'s specialty? ▼
Lydia Chang, M.D. specializes in Pulmonary Disease Physician and practices in Chapel Hill, North Carolina. Credentials: M.D..
How much does Lydia Chang, M.D. prescribe under Medicare Part D? ▼
In 2023, Lydia Chang, M.D. wrote 226 Medicare Part D claims totaling $54K in drug costs for 72 beneficiaries.
Where is Lydia Chang, M.D. located? ▼
Lydia Chang, M.D. is located at 130 MASON FARM RD, Chapel Hill, NC, 27599. Phone: (919) 966-2531.
What is Lydia Chang, M.D.'s NPI number? ▼
Lydia Chang, M.D.'s National Provider Identifier (NPI) is 1972570141, issued on 03/07/2006.
Does Lydia Chang, M.D. prescribe more brand-name or generic drugs? ▼
Lydia Chang, M.D.'s prescribing is 41% brand-name and 59% generic drugs by claim count, with $51K in brand drug costs.
How many Pulmonary Disease Physician providers are there in the US? ▼
There are 9,271 Pulmonary Disease Physician providers across 53 states in the US. The average Pulmonary Disease Physician provider writes 1,457 Medicare Part D claims per year.
What drugs does Lydia Chang, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Lydia Chang, M.D.'s most frequently prescribed drugs include Azithromycin, Trelegy Ellipta, Albuterol Sulfate Hfa. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Lydia Chang, M.D. accept Medicare? ▼
Lydia Chang, M.D. appears in CMS Medicare data with 226 Part D claims and 72 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Lydia Chang, M.D.'s credentials? ▼
Lydia Chang, M.D.'s NPI is 1972570141 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 (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.