Largest pathology and laboratory groups in the US
- Groups
- 969
- Pathology groups
- 969
- Pathology specialists
- 7,106
- Physicians
- 8,049
- More than one site
- 564
There are 969 pathology and laboratory groups in the US with a Medicare PAC ID. Noyes Health is the largest, with 196 physicians.
Find the decision makers at all 969 US pathology and laboratory groups
Work emails and mobile numbers for practice owners, administrators and physician leaders, found through healthcare waterfall enrichment, with a free Dmand AI account.
Noyes Health is the largest pathology and laboratory group in the US, with 196 physicians
Ranked by physicians linked to each group. Integrated Regional Laboratories is second with 181, and PathGroup third with 173. 8 US groups have 100 or more physicians.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
California has the most pathology and laboratory groups, with 111
New York is second with 104 and Florida third with 101. Every state with 5 or more groups has its own list.
- California111
- New York104
- Florida101
- Texas74
- Illinois53
- New Jersey44
- Georgia32
- Michigan30
- Ohio30
- Maryland27
- Pennsylvania25
- Tennessee25
- North Carolina24
- Massachusetts18
- Arkansas17
- Indiana17
- Virginia17
- Colorado16
- Alabama15
- Arizona14
- Missouri13
- Iowa11
- South Carolina11
- Wisconsin11
- Connecticut10
- Kansas10
- Louisiana10
- Kentucky9
- Oregon9
- Oklahoma7
- Puerto Rico7
- Mississippi6
- Utah6
- Washington6
- Minnesota5
- Montana4
- New Hampshire4
- Nevada4
- Wyoming4
- Alaska3
- Delaware3
- Hawaii3
- Idaho3
- Nebraska3
- New Mexico3
- Maine2
- Rhode Island2
- Vermont2
- Washington, DC1
- North Dakota1
- South Dakota1
- West Virginia1
Source: Doctors and Clinicians National Downloadable File (CMS)
Sonic Healthcare has the most physicians in US pathology and laboratory groups, with 464 across 27 groups
59 parent organizations have two or more US pathology and laboratory groups. Among health systems, Trinity Health has the most groups, 13. Each clinician counts once per parent organization.
See every medical group, site and clinician under Sonic Healthcare
Org Hierarchy Explorer maps every group, site of care and clinician under the parent, with the leaders at each group.
Source: Dmand AI Org Hierarchy Data
For sales teams
Dmand AI maps the owners, administrators and physician leaders at each of the 969 US pathology and laboratory groups, with the parent organization above each one, and finds validated work emails and mobile numbers.
52% of US pathology and laboratory groups are independent, with no larger parent organization
A group counts as independent when no health system, platform or other organization sits above it in the org hierarchy. Every other group belongs to a larger organization.
US pathology and laboratory groups by ownership
- Independent503
- Health system or hospital191
- Platform or corporate owner34
- Community or government8
- Other organization233
Sites of care beyond their own offices
See the parent organization above every US group
Dmand AI maps each group to the health system, physician platform or management company above it, so you can sell to the owner, not one site.
Source: Dmand AI Org Hierarchy Data
Each US pathology and laboratory group profile shows the parent, sites, clinicians and identifiers
- Clinicians and specialtiesA count by specialty and a sample of the group's cliniciansOn every profile
- Practice locationsMain site and a sample of practice locations, with a count of the restOn every profile
- Medicare Part B paymentsMedicare payments to the group, from CMSOn every profile
- Group NPI and Medicare PAC IDIdentifiers for matching records across sourcesOn every profile
- Parent organizationThe health system, platform or owner above the groupOn every profile
- Every clinician and siteThe full roster and every practice locationWith a free account
- Leader and clinician contactsWork emails and mobile numbers, found on request and then validatedWith a free account
- EHR used by the group's cliniciansThe EHR in use at the group's sitesWith a free account
Free account: 30 days free, self-serve, no credit card.
Sources: Doctors and Clinicians National Downloadable File (CMS), Medicare Physician & Other Practitioners (CMS) and Dmand AI Org Hierarchy Data
Sources for the US pathology and laboratory group list
| Data on this page | Source |
|---|---|
| Medical groups, specialties and sites | Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Professional Profile Data |
| Parent organizations and independence | Dmand AI Org Hierarchy Data |
| Physicians and HCPs | Dmand AI Affiliation Data |
| Group NPI and PAC ID | NPPES NPI Registry (CMS) and Doctors and Clinicians National Downloadable File (CMS) |
Data last refreshed October 2026Report an inaccuracyRemove my information
Groups whose main specialty is pathology and laboratory and that have a Medicare PAC ID.
FAQ
Frequently asked questions about US pathology and laboratory groups
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
How many pathology and laboratory groups are in the US?
There are 969 pathology and laboratory groups in the US with a Medicare PAC ID. Between them they have 7,106 pathology specialists.
Which state has the most pathology and laboratory groups?
California, with 111, followed by New York with 104 and Florida with 101.
Which companies own the most pathology and laboratory groups?
By physicians, Sonic Healthcare, with 464 across 27 groups, followed by Trinity Health with 103 and Quest Diagnostics with 170.
How many pathology and laboratory groups are independent?
503, or 52%, have no larger parent organization in the Dmand AI org hierarchy. 191 belong to a health system or hospital and 34 to a physician platform or corporate owner.
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