NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1285691824 MD
Verify on CMS → John Lach, MD
Family Medicine Physician in Louisville, Kentucky.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 147,760 in Family 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
128
Medicare Part D claims · 53 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
55%
generic claims · 45% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
John Lach, MD filed 128 Medicare Part D claims in 2023 as a Family Medicine Physician in Louisville, Kentucky, prescribing 55% generic.
- 128
- Part D claims, 2023
- 55%
- generic prescribing
- ≥35th
- 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.
CMS NPPES provider registry desk
NPI 1285691824 · Family Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1285691824
- ENUM-LEGACY 2006
- TAX-MEGA 148K Family Medicine
- RX-LIGHT 128
- BOOK-LIGHT 1,867 in Kentucky
- PHOTO-ENUM Charles Li · 2006
John Lach, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
128 ≥ 35th percentile 35% of 1,370,886 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 · 2023
◑
Board-eligible specialty (heuristic, not verified)
John Lach, 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 John Lach, MD?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
128 96% vs specialty avg
Specialty distribution in Kentucky
How Family Medicine Physician compares to other specialties among Kentucky 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 Family Medicine 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 | 1285691824 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 04/27/2006 |
Brand vs generic prescribing mix · Above average
John Lach, MD - brand share 45.0%
Family Medicine Physician average
45% brand-name claims vs 55% generic, on 128 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.
128
Total Claims
$21K
Total Drug Cost
53
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 191
- Total Day Supply
- 4,272
- Brand vs Generic
- 45% brand / 55% generic
- Brand Drug Cost
- $20K
- Generic Drug Cost
- $2K
- Antibiotic Claims
- 12
Patient Demographics
- Average Patient Age
- 70.5 years
- Avg HCC Risk Score
- 1.32
- Gender Split
- 45% female / 55% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Shingrix Varicella-Zoster Ge/As01b/Pf | 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 John Lach, MD fits within the Family Medicine Physician landscape nationally.
147,760
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
John Lach, MD's 128 claims are below the specialty average of 3,418.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Lach, both outside Kentucky 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 Family Medicine Physician Providers in Kentucky
Other clinicians with the same primary specialty enrolled in Kentucky, drawn from the same CMS NPPES roster as Lach.
One of 1,867 Family Medicine Physician providers enrolled in Kentucky, 5 are shown here.
Dr. Nison Abayev
MD
Louisville, KY
Dr. Sarah Abbeyquaye
D.O.
Richmond, KY
Dr. Lesley Abbott
D.O.
Flatwoods, KY
Dr. Faten Abdullah
M.D.
Louisville, KY
Dr. Matthew Abel
MD
Nicholasville, KY
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is John Lach, MD's specialty? ▼
John Lach, MD specializes in Family Medicine Physician and practices in Louisville, Kentucky. Credentials: MD.
How much does John Lach, MD prescribe under Medicare Part D? ▼
In 2023, John Lach, MD wrote 128 Medicare Part D claims totaling $21K in drug costs for 53 beneficiaries.
Where is John Lach, MD located? ▼
John Lach, MD is located at 2355 POPLAR LEVEL RD, Louisville, KY, 40217. Phone: (502) 636-7444.
What is John Lach, MD's NPI number? ▼
John Lach, MD's National Provider Identifier (NPI) is 1285691824, issued on 04/27/2006.
Does John Lach, MD prescribe more brand-name or generic drugs? ▼
John Lach, MD's prescribing is 45% brand-name and 55% generic drugs by claim count, with $20K in brand drug costs.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,760 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 John Lach, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, John Lach, MD's most frequently prescribed drugs include Shingrix. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does John Lach, MD accept Medicare? ▼
John Lach, MD appears in CMS Medicare data with 128 Part D claims and 53 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Lach, MD's credentials? ▼
John Lach, MD's NPI is 1285691824 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 (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
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 May 2026.