# NAICS 621491: HMO Medical Centers

Breadcrumb: [NAICS codes](https://bidrover.com/naics) › [621491 HMO Medical Centers](https://bidrover.com/naics/621491)

This U.S. industry comprises establishments with physicians and other medical staff primarily engaged in providing a range of outpatient medical services to the health maintenance organization (HMO) subscribers with a focus generally on primary health care. These establishments are owned by the HMO.

- NAICS code: 621491
- Title: HMO Medical Centers
- Sector: 62 Health Care and Social Assistance
- Subsector: 621 Ambulatory Health Care Services
- Industry group: 6214 Outpatient Care Centers
- NAICS industry: 62149 Other Outpatient Care Centers
- SBA size standard: $44.5 million average annual receipts
- Open bids on BidRover: 0

## Open bids (0)

No open bids cite this code right now.

## Frequently asked questions

### What is NAICS code 621491?

NAICS 621491 is "HMO Medical Centers" in the 2022 North American Industry Classification System, in sector 62 (Health Care and Social Assistance). This U.S. industry comprises establishments with physicians and other medical staff primarily engaged in providing a range of outpatient medical services to the health maintenance organization (HMO) subscribers with a focus generally on primary health care. These establishments are owned by the HMO.

### What is the SBA size standard for NAICS 621491?

A business is small under NAICS 621491 at or below $44.5 million average annual receipts, including affiliates (13 CFR 121.201). Confirm the standard named in each solicitation.

### How many government bids are open under NAICS 621491?

No open bid in BidRover cites NAICS 621491 right now. Many state and local notices do not list a NAICS code, so a keyword alert for this work catches more of them.

### How do I get alerts for NAICS 621491 bids?

Save an alert on this page. A free account gets new matching bids by weekly email; the Team plan ($19/mo) sends daily alerts with match scores, the buyer, source link and documents.

## Related NAICS codes

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- [524114 Direct Health and Medical Insurance Carriers](https://bidrover.com/naics/524114)
- [621492 Kidney Dialysis Centers](https://bidrover.com/naics/621492)
- [621493 Freestanding Ambulatory Surgical and Emergency Centers](https://bidrover.com/naics/621493)
- [621498 All Other Outpatient Care Centers](https://bidrover.com/naics/621498)
- [621410 Family Planning Centers](https://bidrover.com/naics/621410)
- [621420 Outpatient Mental Health and Substance Abuse Centers](https://bidrover.com/naics/621420)

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Code titles and definitions: U.S. Census Bureau, North American Industry Classification System (NAICS), 2022 (https://www.census.gov/naics/). Size standards: U.S. Small Business Administration, Small Business Size Standards, 13 CFR 121.201, eCFR text current as of 2026-10-21 (https://www.ecfr.gov/current/title-13/section-121.201).

BidRover lists bids from official public sources. It is not an issuing authority; confirm the NAICS code and size standard named in each solicitation.