Medicare Advantage organization · contract H5433
CalOptima Health OneCare
Legal entity: ORANGE COUNTY HEALTH AUTHORITY
Parent: Orange County Health Authority
What is CalOptima Health OneCare?
Per the CMS Medicare Advantage Plan Directory, CalOptima Health OneCare is a Local CCP offering HMO/HMOPOS plans under CMS contract H5433 , CMS region Kansas City , part of Orange County Health Authority. CMS-reported enrollment: 18,849.
This is a directory of organizations — it does NOT show plan premiums, benefits, copays, or star ratings. To compare actual Medicare Advantage plans in your area, use medicare.gov/plan-compare. Free help: call your State Health Insurance Assistance Program (SHIP) or 1-800-MEDICARE.
What the enrollment figure means
The enrollment of 18,849 is the number as submitted by CalOptima Health OneCare to CMS and published in the CMS MA Plan Directory. It is a CMS-directory figure — not a verified headcount of current active beneficiaries, not a quality indicator, and not a factor in star ratings. Larger enrollment does not mean better plans.
How to compare Medicare Advantage organizations
This directory lists organizations by CMS contract. To compare plans by premiums, star ratings, benefits, and availability in your county, use the official Medicare Plan Finder. Key dimensions to compare: organization type, plan type (MA-PD, PFFS, PACE), CMS region, and enrollment — all shown on this page. Star ratings (1–5) are on the star ratings page for CalOptima Health OneCare or browse all star ratings.
CMS Directory Contact
This is the administrative directory contact as submitted to CMS — not necessarily a consumer enrollment help line.
- Name
- Customer Service
- Phone
- 1-877-412-2734
- acardenas@caloptima.org
- Address
- 505 City Parkway West, Orange, CA, 92868
- Last updated
- 02/28/2017
Frequently asked questions
What type of organization is CalOptima Health OneCare?
CalOptima Health OneCare (CMS contract H5433) is classified by CMS as a Local CCP offering HMO/HMOPOS plans. It is part of Orange County Health Authority. Tax status: Not-for-Profit/Non-Profit. This classification is verbatim from the CMS Medicare Advantage Plan Directory.
How many people are enrolled in CalOptima Health OneCare?
The CMS Medicare Advantage Plan Directory reports enrollment of 18,849 for CalOptima Health OneCare (contract H5433). This is the enrollment as submitted to CMS by the organization. It is a directory figure — not a count of current active members or a quality indicator.
Which CMS region does CalOptima Health OneCare operate in?
The CMS Medicare Advantage Plan Directory lists CalOptima Health OneCare (contract H5433) under CMS region Kansas City. CMS regions are administrative divisions used for oversight — they do not directly correspond to the geographic areas where individual plans are available. To find plans available in your county, use medicare.gov/plan-compare.
Does CalOptima Health OneCare show premiums, copays, or coverage details here?
No. This page is a directory of the organization as listed in the CMS Medicare Advantage Plan Directory — it shows who the organization is, its type, parent, and enrollment. It does NOT show individual plan premiums, deductibles, drug formularies, copays, or star ratings. To compare actual Medicare Advantage plans, premiums, and coverage available in your area, use the official Medicare Plan Finder at medicare.gov/plan-compare. For free, unbiased help, contact your State Health Insurance Assistance Program (SHIP) or call 1-800-MEDICARE (1-800-633-4227).
How do I contact CalOptima Health OneCare?
The CMS MA Plan Directory lists Customer Service as the directory contact for CalOptima Health OneCare (contract H5433): 1-877-412-2734, acardenas@caloptima.org. This is the administrative CMS-directory contact, not necessarily a consumer help line. For Medicare enrollment assistance, call 1-800-MEDICARE or contact your SHIP.
What to do next
- Compare plans and enroll: medicare.gov/plan-compare — the official Medicare Plan Finder. Compare premiums, benefits, drug coverage, and star ratings for plans available in your ZIP code.
- Free unbiased help: contact your State Health Insurance Assistance Program (SHIP) — a free counseling service — or call 1-800-MEDICARE (1-800-633-4227), 24 hours a day, 7 days a week.
- Official CMS directory: CMS MA Plan Directory — the source of this data (monthly release).
RECORDED — all figures on this page are verbatim from the CMS Medicare Advantage Plan Directory: organization name, type, plan type, parent, region, enrollment, and contact. Accuracy depends on carrier submissions to CMS, not Atlas Commons modeling.
This directory entry informs — it does not rank, recommend, or show plan benefits or premiums. Data generated June 24, 2026.
Machine-readable: JSON-LD · Markdown · Source: CMS Medicare Advantage