Quick answers
- Where is Serenethos Care Center, LLC?
- 22822 Myrtle Street, Hayward, CA 94541, in Alameda County, California.
- What is the phone number of Serenethos Care Center, LLC?
- (510) 537-4844, as listed by Medicare (CMS).
- What is the Medicare star rating of Serenethos Care Center, LLC?
- Medicare overall rating: 5 out of 5 stars (CMS data updated 2026-10-01).
- Has Serenethos Care Center, LLC been fined?
- Medicare lists no fines for Serenethos Care Center, LLC.
- What did inspectors find at Serenethos Care Center, LLC?
- In its last three inspection cycles (December 16, 2022 to June 20, 2025), Medicare lists 25 health citations; the most serious was level L. 3 were level G or higher (actual harm or immediate jeopardy). See the list below (CMS data updated 2026-10-01).
Medicare ratings, explained
Star ratings are one piece of information. Visit, ask questions and talk with your doctor about what matters for your care.
Inspections, fines and staffing
In its last three inspection cycles (December 16, 2022 to June 20, 2025), Serenethos Care Center, LLC had 25 health citations; the most serious was level L (immediate jeopardy to resident health or safety). 3 of them were level G or higher (actual harm or immediate jeopardy). Medicare lists no fines or payment denials for it in the last three years. Nurse staffing is 3.66 hours per resident per day; the California average is 4.54 and the national average is 3.90.
Source: Medicare (CMS) Provider Data Catalog, data updated October 1, 2026, retrieved November 13, 2026.
Inspection history: last three cycles
State inspectors visit about once a year and also investigate complaints. Each citation (deficiency) has a tag number and a letter, A to L. The letter shows how serious the problem was and how many residents it affected.
What the letters A to L mean
| Seriousness | Isolated (a few residents) | Pattern (some) | Widespread (many) |
|---|---|---|---|
| No actual harm, potential for minimal harm | A | B | C |
| No actual harm, potential for more than minimal harm | D | E | F |
| Actual harm to residents | G | H | I |
| Immediate jeopardy to resident health or safety | J | K | L |
Source: the scope and severity grid Medicare (CMS) uses for nursing home citations.
Most recent cycle: June 20, 2025 — 3 health citations
Inspections in this cycle: June 20, 2025 (standard health inspection).
Show 3 citations (levels A to F, no actual harm)
F0801 Level E
“Employ sufficient staff with the appropriate competencies and skills sets to carry out the functions of the food and nutrition service, including a qualified dietician.”
F0641 Level D
“Ensure each resident receives an accurate assessment.”
F0759 Level D
“Ensure medication error rates are not 5 percent or greater.”
Previous cycle: May 10, 2024 — 11 health citations
Inspections in this cycle: May 10, 2024 (standard health inspection).
Show 11 citations (levels A to F, no actual harm)
F0755 Level E
“Provide pharmaceutical services to meet the needs of each resident and employ or obtain the services of a licensed pharmacist.”
F0759 Level E
“Ensure medication error rates are not 5 percent or greater.”
F0812 Level E
“Procure food from sources approved or considered satisfactory and store, prepare, distribute and serve food in accordance with professional standards.”
F0867 Level E
“Set up an ongoing quality assessment and assurance group to review quality deficiencies and develop corrective plans of action.”
F0880 Level E
“Provide and implement an infection prevention and control program.”
F0908 Level E
“Keep all essential equipment working safely.”
F0912 Level E
“Provide rooms that are at least 80 square feet per resident in multiple rooms and 100 square feet for single resident rooms.”
F0925 Level E
“Make sure there is a pest control program to prevent/deal with mice, insects, or other pests.”
F0550 Level D
“Honor the resident's right to a dignified existence, self-determination, communication, and to exercise his or her rights.”
F0677 Level D
“Provide care and assistance to perform activities of daily living for any resident who is unable.”
F0757 Level D
“Ensure each resident’s drug regimen must be free from unnecessary drugs.”
Earlier cycle: December 16, 2022 — 11 health citations
Inspections in this cycle: December 16, 2022 (standard health inspection).
F0801 Level L
“Employ sufficient staff with the appropriate competencies and skills sets to carry out the functions of the food and nutrition service, including a qualified dietician.”
immediate jeopardy to resident health or safety; widespread (many residents) · Nutrition and Dietary Deficiencies
F0726 Level J
“Ensure that nurses and nurse aides have the appropriate competencies to care for every resident in a way that maximizes each resident's well being.”
immediate jeopardy to resident health or safety; isolated (a few residents) · Nursing and Physician Services Deficiencies
F0800 Level J
“Provide each resident with a nourishing, palatable, well-balanced diet that meets his or her daily nutritional and special dietary needs.”
immediate jeopardy to resident health or safety; isolated (a few residents) · Nutrition and Dietary Deficiencies
Show 8 less serious citations (levels A to F)
F0802 Level F
“Provide sufficient support personnel to safely and effectively carry out the functions of the food and nutrition service.”
F0812 Level F
“Procure food from sources approved or considered satisfactory and store, prepare, distribute and serve food in accordance with professional standards.”
F0814 Level F
“Dispose of garbage and refuse properly.”
F0880 Level F
“Provide and implement an infection prevention and control program.”
F0908 Level F
“Keep all essential equipment working safely.”
F0677 Level D
“Provide care and assistance to perform activities of daily living for any resident who is unable.”
F0690 Level D
“Provide appropriate care for residents who are continent or incontinent of bowel/bladder, appropriate catheter care, and appropriate care to prevent urinary tract infections.”
F0912 Level B
“Provide rooms that are at least 80 square feet per resident in multiple rooms and 100 square feet for single resident rooms.”
Citation descriptions are Medicare’s official wording. “From a complaint” means the citation came from a complaint investigation instead of the regular yearly inspection.
Full inspection reports on Medicare Care Compare →
Fire safety citations (44)
E0004 Level F
“Develop and maintain an Emergency Preparedness Program (EP).”
E0015 Level F
“Address subsistence needs for staff and patients.”
E0039 Level F
“Conduct testing and exercise requirements.”
K0353 Level F
“Inspect, test, and maintain automatic sprinkler systems.”
K0355 Level F
“Properly select, install, inspect, or maintain portable fire extinguishes.”
K0363 Level F
“Install corridor and hallway doors that block smoke.”
K0161 Level D
“Use approved construction type or materials.”
K0342 Level D
“Have a complete alarm system manually initiated and initiated by fire sprinkler system connection.”
E0030 Level C
“List the names and contact information of those in the facility.”
K0291 Level C
“Install emergency lighting that can last at least 1 1/2 hours.”
K0293 Level C
“Have properly located and lighted "Exit" signs.”
K0341 Level C
“Install a fire alarm system that can be heard throughout the facility.”
E0015 Level F
“Address subsistence needs for staff and patients.”
E0026 Level F
“Establish roles under a Waiver declared by secretary.”
E0032 Level F
“Provide primary/alternate means for communication.”
E0037 Level F
“Establish staff and initial training requirements.”
E0039 Level F
“Conduct testing and exercise requirements.”
K0345 Level F
“Have approved installation, maintenance and testing program for fire alarm systems.”
K0712 Level F
“Have simulated fire drills held at unexpected times.”
E0031 Level E
“Provide emergency officials' contact information.”
K0344 Level E
“Have an alternate power supply for its alarm system.”
K0353 Level E
“Inspect, test, and maintain automatic sprinkler systems.”
K0363 Level E
“Install corridor and hallway doors that block smoke.”
K0711 Level E
“Provide a written emergency evacuation plan.”
K0921 Level E
“Ensure that testing and maintenance of electrical equipment is performed.”
K0923 Level E
“Have proper medical gas storage and administration areas.”
K0291 Level D
“Install emergency lighting that can last at least 1 1/2 hours.”
K0346 Level D
“Follow proper procedures when the fire alarm was out of service for more than 4 hours.”
K0354 Level D
“Follow proper procedures when the automatic sprinkler systems was out of service for more than 10 hours.”
K0355 Level D
“Properly select, install, inspect, or maintain portable fire extinguishes.”
K0362 Level D
“Ensure that corridors are separated from use areas by walls constructed to limit the passage of smoke.”
K0363 Level F
“Install corridor and hallway doors that block smoke.”
K0712 Level F
“Have simulated fire drills held at unexpected times.”
E0004 Level D
“Develop and maintain an Emergency Preparedness Program (EP).”
E0015 Level D
“Address subsistence needs for staff and patients.”
E0030 Level D
“List the names and contact information of those in the facility.”
E0031 Level D
“Provide emergency officials' contact information.”
E0032 Level D
“Provide primary/alternate means for communication.”
E0039 Level D
“Conduct testing and exercise requirements.”
K0293 Level D
“Have properly located and lighted "Exit" signs.”
4 more fire safety citations are not listed here.
Staffing
Hours of nursing care per resident per day, from the payroll records nursing homes send to Medicare, next to the state and national averages.
| Measure | This home | California | National |
|---|---|---|---|
| Registered nurse (RN) hours per resident per day | 0.28 | 0.68 | 0.69 |
| Licensed practical nurse (LPN) hours per resident per day | 0.84 | 1.20 | 0.86 |
| Nurse aide hours per resident per day | 2.54 | 2.66 | 2.35 |
| Total nurse staff hours per resident per day | 3.66 | 4.54 | 3.90 |
| Total nurse staff hours per resident per day on the weekend | 3.63 | 4.10 | 3.43 |
| RN hours per resident per day on the weekend | 0.28 | 0.52 | 0.48 |
| Nursing staff turnover (per year) | 27.6% | 36.6% | 45.3% |
Source: Medicare (CMS) Provider Information and State US Averages, data updated October 1, 2026.
Owners and operator
Owners and managers Medicare lists (4)
| Name | Role | Share | Since |
|---|---|---|---|
| Serenethos Care Center, LLC | Direct owner | 100% | March 1, 2018 |
| Baldwin, Ronald | Direct owner | NOT APPLICABLE | March 1, 2018 |
| Xie, Qing | Direct owner | NOT APPLICABLE | March 1, 2018 |
| Serenethos Care Center, LLC | Management company (operational or managerial control) | NOT APPLICABLE | March 1, 2018 |
Source: Medicare (CMS) Ownership file, data updated October 1, 2026. Only owners with an ownership interest and management companies are shown.
Compare with other nursing homes
Key facts
| Type | Nursing home |
|---|---|
| Certified beds | 36 |
| Average residents per day | 31.9 |
| Takes part in | Medicare and Medicaid |
| Ownership | For profit – limited liability company |
| First approved by Medicare/Medicaid | 2017-05-16 |
| Resident and family councils | Resident council |
| Sprinklers in all required areas | Yes |
| Changed ownership in the last 12 months | No |
| Address | 22822 Myrtle Street, Hayward, CA 94541 |
| County | Alameda County |
| State | California |
| Phone | (510) 537‑4844 |
| CMS Certification Number | 555905 |
| Name in Medicare records | SERENETHOS CARE CENTER, LLC |
| Corrections | Report an error or suggest an update → |
What to ask when you call or visit
A general checklist for any nursing home, not advice about this one. Medicare also publishes guides on medicare.gov.
- Is the home certified by Medicare and/or Medicaid, and does it have a bed for the care you need (short-term rehab or long-term care)?
- Can you see the latest state inspection report? Ask how any problems found were fixed.
- How many nurses and aides work on each shift, at night and on weekends? Is there a registered nurse on site at all times?
- Which doctors see residents, and how often? What happens in a medical emergency, and which hospital is used?
- What therapy (physical, occupational, speech) is offered, and how many days a week?
- Are residents clean, dressed and taking part in activities? Do staff speak to them kindly and answer call lights quickly?
- What do the daily rate and extra services cost, and what do Medicare, Medicaid or your insurance pay? Ask for it in writing.
- Is there a resident council and a family council? How are complaints handled? Ask for the long-term care ombudsman’s contact.
- Are meals appetizing, and can the home meet special diets, language needs and religious or cultural preferences?
- Visit more than once, including at a mealtime or in the evening, without an appointment.
Other nursing homes nearby
By straight-line distance (not driving distance).
- St Anthony Care Center0.4 mi · Hayward, CA · 5 of 5 stars
- Bethesda Home0.5 mi · Hayward, CA · 3 of 5 stars
- We Care Skilled Nursing Facility0.8 mi · Hayward, CA · 5 of 5 stars
- Golden Harbor Healthcare Center0.8 mi · Hayward, CA · 2 of 5 stars
- Morton Bakar Center1.0 mi · Hayward, CA · 5 of 5 stars
Nearest hospital emergency rooms
- St Rose Hospital2.1 mi · Hayward, CA · Acute Care Hospital
- Eden Medical Center2.2 mi · Castro Valley, CA · Acute Care Hospital
- Kaiser Foundation Hospital - San Leandro5.1 mi · San Leandro, CA · Acute Care Hospital
Sources
- Provider Information — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-01, retrieved 2026-11-13
- Medicare Care Compare — official Medicare profile of this provider
- Health Deficiencies — CMS, data updated 2026-10-01, retrieved 2026-11-13
- Fire Safety Deficiencies — CMS, data updated 2026-10-01, retrieved 2026-11-13
- Penalties — CMS, data updated 2026-10-01, retrieved 2026-11-13
- Ownership — CMS, data updated 2026-10-01, retrieved 2026-11-13
- State US Averages — CMS, data updated 2026-10-01, retrieved 2026-11-13
- Survey Summary — CMS, data updated 2026-10-01, retrieved 2026-11-13
- Citation Code Look-up — CMS, data updated 2026-10-01, retrieved 2026-11-13
- Inspection Dates — CMS, data updated 2026-10-01, retrieved 2026-11-13