The law: Knox-Keene, the DMHC & dental specialties
What the Knox-Keene Act is, what it requires of every health plan in California — and a straight, sourced answer to a question this site keeps running into: is a “prosthodontist” a recognized dental specialty, and where does the law require access to one?
The foundation
What is the Knox-Keene Act?
The is the California law that governs health care service plans — including HMOs, most Medi-Cal managed care plans, and specialized plans like dental, vision, and behavioral health. It lives in the Health & Safety Code beginning at section 1340.
Since 2000, the Act has been enforced by the Department of Managed Health Care (DMHC) (the responsibility moved there from the Department of Corporations). To operate, a plan must hold a Knox-Keene license from the DMHC — and that license comes with real, ongoing duties.
The duties
What Knox-Keene requires of every plan
Network adequacy
Maintain a network with enough providers — of the right types, close enough, available soon enough — to deliver every covered service. This is .
H&S § 1367(e); 28 CCR §§ 1300.51, 1300.67.2.
Timely access
Meet appointment wait-time standards so care is actually available in a reasonable time — including for dental services.
H&S § 1367.03; 28 CCR § 1300.67.2.2.
Accurate provider directories
Publish and maintain accurate directories of contracting providers — the law at the center of the Health Net case.
H&S § 1367.27.
Grievances & appeals
Run a grievance system and resolve standard grievances in writing within 30 days.
H&S § 1368; 28 CCR § 1300.68.
Quality assurance
Operate a quality-assurance program to monitor and improve the care delivered to enrollees.
H&S § 1370.
Financial solvency
Hold adequate reserves and tangible net equity so the plan can pay for the care it promises.
H&S § 1375.1 et seq.
Dental plans are covered too
Specialized dental plans are licensed under Knox-Keene and must meet network-adequacy, timely-access, and directory-accuracy duties. California has recently strengthened dental network-adequacy review, directing regulators to assess the adequacy of an entire dental provider network.
H&S § 1367.03 (timely access, as amended for dental); DMHC dental network-adequacy review.
The question we keep hitting
Is a “prosthodontist” a recognized dental specialty?
Yes — unambiguously. Prosthodontics is one of the 12 dental specialties formally recognized in the United States by the National Commission on Recognition of Dental Specialties and Certifying Boards (the body that, since 2018, performs the recognition formerly done by the American Dental Association).
The 12 recognized dental specialties
| Dental Anesthesiology | Oral & Maxillofacial Pathology |
| Dental Public Health | Oral & Maxillofacial Radiology |
| Endodontics | Oral & Maxillofacial Surgery |
| Oral Medicine | Orofacial Pain |
| Orthodontics & Dentofacial Orthopedics | Pediatric Dentistry |
| Periodontics | Prosthodontics |
Source: National Commission on Recognition of Dental Specialties and Certifying Boards (NCRDSCB) — ncrdscb.ada.org/recognized-dental-specialties.
What a prosthodontist is
“Prosthodontics is the dental specialty pertaining to the diagnosis, treatment planning, rehabilitation and maintenance of the oral function, comfort, appearance and health of patients with clinical conditions associated with missing or deficient teeth and/or oral and maxillofacial tissues using biocompatible substitutes.”
Definition: NCRDSCB / American College of Prosthodontists. In plain terms — the specialist for complex dentures, implants, and full-mouth rehabilitation.
In California, who may practice and hold out as a specialist is governed by the Dental Practice Act (Business & Professions Code) and the Dental Board of California, and a provider’s license and specialty can be verified through the Department of Consumer Affairs (DCA) license lookup.
The answer
So where does the law require access to a prosthodontist?
Yes — Medi-Cal’s Dental Managed Care methodology lists prosthodontics as a REQUIRED provider type
For Medi-Cal dental, DHCS certifies each Dental Managed Care (DMC) plan’s network every year and submits that certification to the federal government (CMS). DHCS’s published methodology requires DMC plans to contract with these provider types — and prosthodontics is explicitly on the list:
Primary Care Dentists · Endodontics · Oral & Maxillofacial Surgery · Orthodontics · Pedodontics · Periodontics · Prosthodontics.
Source: DHCS, Medi-Cal Dental Managed Care (DMC) Methodology Overview (Aug 29, 2025), issued under Welfare & Institutions Code § 14197 and 42 C.F.R. §§ 438.68, 438.206, 438.207.
And the standards that come with it
| Requirement | Medi-Cal DMC standard |
|---|---|
| Time or distance — total dentists (primary care and specialty) | 10 miles or 30 minutes from the member’s residence |
| Provider-to-member ratio — total dentists (primary + specialty) | 1 : 1,200 |
| How DHCS validates access | , at least quarterly |
| Required specialty provider types | Includes Prosthodontics (with endodontics, oral & maxillofacial surgery, orthodontics, pedodontics, periodontics) |
Source: DHCS Medi-Cal DMC Methodology Overview, Tables 1–2 and the required-provider-type list.
A note on DMHC’s own rulebook
For completeness: the DMHC’s general access regulation (28 CCR § 1300.67.2.2) regulates dental as a category and does not enumerate individual dental specialties — the word “prosthodontist” doesn’t appear in it. But for Medi-Cal dental, the governing standards are the DHCS DMC methodology above and Welfare & Institutions Code § 14197 (the statute SB 530 extended through 2029) — and those do require prosthodontics, within 10 miles or 30 minutes.
If a plan can’t meet the standard, it must ask the State — in writing
A plan can’t simply fall short and stay quiet. Under Welfare & Institutions Code § 14197, a DMC plan that cannot meet the time-or-distance standard for a provider type must submit an Alternative Access Standard (AAS) request to DHCS — and only after it has exhausted all reasonable options to contract with providers. Per DHCS’s methodology, that request must:
- be organized by ZIP code and county, with the driving time/distance between the nearest in-network provider and the most remote members;
- detail the plan’s contracting efforts and the circumstances that prevented a contract; and
- spell out an immediate plan to deliver the service (for example, out-of-network providers) and a long-term plan to actually build the network.
DHCS approves or denies each request by ZIP code and provider type, approvals last three years, and DHCS posts approved AAS requests on its website — so whether a plan holds an approved exception for a given specialty and area is a matter of public record.
Source: DHCS Medi-Cal DMC Methodology Overview (Alternative Access Standard Requests); W&I § 14197(f).
And if the network truly can’t deliver?
The plan must still arrange and pay for out-of-network care — commonly through a — and honor continuity-of-care rights. A plan cannot satisfy a 10-mile / 30-minute standard by sending a member hundreds of miles away.
Why this matters for the Health Net case
Prosthodontics is a required Medi-Cal DMC provider type that must sit within 10 miles or 30 minutes of the member — and DHCS is supposed to test that with quarterly secret-shopper surveys. Health Net’s own representative confirmed zero prosthodontists in Sacramento County and offered one 300+ miles away. That isn’t an alternative access standard — it’s a network-adequacy deficiency in the exact category the State certifies to CMS. See the provider-directory injunction.
And a fair question for the record: did the plan ever file an AAS request for prosthodontics in Sacramento County? Approved AAS requests are public on DHCS’s website. If none was filed, “zero” was simply left unaddressed; if one was, an AAS still requires an immediate plan to deliver the service — not a 300-mile dead end.
Key citations
Sources, so you can verify everything
| Topic | Authority |
|---|---|
| Knox-Keene Act | Health & Safety Code § 1340 et seq.; administered by the DMHC |
| Network adequacy | H&S § 1367(e); 28 CCR §§ 1300.51, 1300.67.2 |
| Timely access (incl. dental) | H&S § 1367.03; 28 CCR § 1300.67.2.2 |
| Provider directory accuracy | H&S § 1367.27 |
| Grievances (30-day) | H&S § 1368; 28 CCR § 1300.68 |
| Medi-Cal time/distance & appointments | Welfare & Institutions Code § 14197 (extended by SB 530) |
| Medi-Cal dental network adequacy & required specialty types (incl. prosthodontics) | DHCS Medi-Cal Dental Managed Care (DMC) Methodology Overview; WIC § 14197; 42 C.F.R. §§ 438.68, 438.206, 438.207 |
| Recognized dental specialties (incl. prosthodontics) | National Commission on Recognition of Dental Specialties & Certifying Boards (NCRDSCB) |
| Dental licensure & specialty practice in CA | Dental Practice Act (Bus. & Prof. Code); Dental Board of California; DCA license lookup |
This page is general legal information, not legal advice. Citations are provided so you can read the primary sources yourself. If a specific rule changes, the primary source controls.