*524Relator Matthew Omlansky (plaintiff), by virtue of knowledge gleaned as a state employee involved with the Medi-Cal program, brought this qui tam action in the name of the State of California alleging that defendant Save Mart Supermarkets (Save Mart) had violated the False Claims Act ( Gov. Code, § 12650 et seq. ) in its billings to Medi-Cal for prescription and nonprescription medications, charging a higher price than cash customers paid in violation of 2009 statutory provisions capping Medi-Cal charges at a provider's usual and customary price (hereafter statutory cap). As the trial court succinctly encapsulated the gist of the alleged fraud upon Medi-Cal, Save Mart generally offered a lower price for medications to cash customers, and would also match a lower price that a competitor was offering (although it appears from an exhibit to the complaint that the latter applied only to *525prescriptions), but did not apply these discounts from its list prices in the billings it submitted to Medi-Cal. The People declined to intervene.
The trial court sustained a demurrer to the original complaint because all of the *870alleged violations occurred during a period when the 2009 statutory cap was subject to a federal injunction. Plaintiff then filed an essentially identical amended complaint. The only significant change was an allegation in paragraph 45 that Save Mart's billing practices favoring cash customers continued from December 2016 to March 2017 after the expiration of the injunction, specifying six examples of "illegal pricing." The court sustained Save Mart's demurrer to this pleading as to two of the six grounds raised, and denied leave to amend. It entered a judgment of dismissal. Plaintiff filed a timely notice of appeal.
On appeal, plaintiff purports to challenge the basis for the trial court's ruling in sustaining the demurrer to his original complaint with leave to amend. He also argues that the trial court erred in rejecting his claim that there are bases other than the 2009 statute on which to premise Save Mart's duty to limit billings to that statutory cap. As we agree with the trial court on this ground for its ruling,1 we shall affirm the judgment of dismissal.
We do not need to add anything further at this point from the complaint to this overview of the nature of this appeal. We will include any additional background necessary to our legal analysis in the Discussion.
DISCUSSION
1.0 The Ruling on the Original Complaint is not Before Us
In the present case, the trial court sustained the demurrer to the original complaint in its entirety. Plaintiff did not stand on his pleading and request a judgment of dismissal to challenge that ruling, submitting instead an amended complaint with new allegations to underlie the reiterated causes of action. He contends he is entitled to challenge the earlier ruling. He is wrong.
It is where a demurrer is sustained only in part and a plaintiff chooses not to amend that part in response that the plaintiff may then challenge the ruling on that demurrer on appeal from the final judgment (see Code Civ. Proc., § 472c, subd. (b)(1) [review of prior order sustaining demurrer in part is "open on appeal" after filing subsequent pleading] ); even in that circumstance, any amendment of the portion of the complaint as to which the court sustained the demurrer waives consideration of the ruling in an appeal from *526the final judgment ( County of Santa Clara v. Atlantic Richfield Co. (2006) 137 Cal.App.4th 292, 312, 40 Cal.Rptr.3d 313 ; Duke v. Superior Court (2017) 18 Cal.App.5th 490, 498, 226 Cal.Rptr.3d 807 ). What is appealable from a prior interim ruling are causes of action on which a plaintiff elects to stand. Plaintiff, on the other hand, attempted to revive all his causes of action through different factual allegations. As a result, he has forfeited our review of the prior ruling. ( Gaglione v. Coolidge (1955) 134 Cal.App.2d 518, 521, 286 P.2d 568.)
2.0 The Premise of the False Claim is Lacking
An overture of the obvious before we engage with the specifics of the present case: "Medicaid is a cooperative federal-state program that provides medical care to needy individuals. To qualify for federal funds, States must submit to a federal agency (CMS [Centers for Medicare & Medicaid Services], a division of the Department of Health and Human Services) a state Medicaid plan that details the nature and scope of the State's Medicaid program. It must also submit any amendments to the plan that it may make from time to *871time. And it must receive the agency's approval of the plan and any amendments.... [Citations.] And the agency's director has specified that the agency will not provide federal funds for any state plan amendment until the agency approves the amendment." ( Douglas v. Independent Living Center of Southern California, Inc. (2012) 565 U.S. 606, 610-611, 132 S.Ct. 1204, [182 L.Ed.2d 101, 106].) Medi-Cal is our state's Medicaid program. ( California Assn. for Health Services at Home v. State Dept. of Health Services (2007) 148 Cal.App.4th 696, 701, 56 Cal.Rptr.3d 102.)
The statutory cap on the reimbursement of pharmacy Medi-Cal providers, which is premised on the lowest price that is routinely offered to any segment of the general public or other insurers, was enacted in 2009. ( Welf. & Inst. Code, § 14105.45, subd. (b), as amended by Stats. 2009-2010, 4th Ex. Sess., ch. 5, § 38, eff. July 28, 2009, & § 14105.455, subd. (b), added by Stats. 2009-2010, 4th Ex. Sess., ch. 5, § 39;2 see Legis. Counsel's Dig., Assem. Bill No. 5 (2009-2010 4th Ex. Sess.) (hereafter ch. 5) at < http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=200920100AB5> [as of July 31, 2019].)3
*527Section 14105.45 states that its provisions are to be consistent with federal law, and to that end the necessary federal approval is required before implementing them. (Id. , former subd. (e) [now subd. (c) ].) The pleadings do not allege the issuance of any federal approvals of section 14105.45, and the legislative history in connection with the 2011 amendments discussed in footnote 3, ante , would indicate that approval of the 2009 amendments had not been forthcoming at least as of that time.4 While plaintiff's briefing on appeal is tenebrous on this point, both the trial court and Save Mart on appeal point to the failure of plaintiff ever to contend that he could amend his pleadings to allege the necessary federal approval that would bring this 2009 statutory cap into effect before his amended pleading and impose a duty on Save Mart to incorporate it into its Medi-Cal billings. Given that plaintiff is proceeding on a cause of action arising from statute, it is his obligation to plead his right to proceed with particularity, not Save Mart's to establish a failing. (E.g., *872Searcy v. Hemet Unified School Dist. (1986) 177 Cal.App.3d 792, 802, 223 Cal.Rptr. 206 [Government Claims Act] ; Watts v. Currie (1940) 38 Cal.App.2d 615, 618, 101 P.2d 764 [Moratorium Act of 1935; "if a plaintiff seeks to fasten a liability upon a defendant through the medium of a particular statute, he must allege sufficient facts in his complaint to bring the defendant within the scope of the statute; and ... until he does so[,] the defendant is not called upon to plead facts to take him out of the operation of the statute"].) We thus turn to plaintiff's strained efforts to find a duty on Save Mart's part to charge Medi-Cal a price lower than the cost-plus formula that continued to prevail under prior statutory law in the absence of federal approval of the 2009 (or 2011) change.
The 2009 Legislative Counsel Digest, cited in footnote 3, ante , specifically states, "Existing law requires the reimbursement to Medi-Cal pharmacy providers ... to consist of the estimated acquisition cost of the drug, as defined, plus a professional fee for dispensing. [¶] This bill would require pharmacy providers to submit their usual and customary charge .... The bill *528would require that payment to pharmacy providers be the lower of the ... usual and customary charge or the above-described reimbursement rate" (ch. 5, p. 8, italics added), a point reiterated in the 2011 legislative history. Plaintiff asserts nonetheless that the state Medicaid plan in effect at the time of his complaint5 already incorporated a version of the 2009 statutory cap in reflection of general Medicare provisions, and the 2009 enactment simply added charges to private insurers as an additional cap. He also contends provisions limiting reimbursement to charges to the general public are found in administrative regulations first enacted in the 1970s, and in Medi-Cal publications.
To the extent plaintiff invokes the general provisions of federal Medicare law, he does not provide any authority under which these have any direct effect on the rates at which California reimburses providers of pharmacy services. It is the state plan that defines Medi-Cal coverage. We thus do not need to explore the nuances of federal law.
Plaintiff's claim that the state Medi-Cal plan had previously capped prescription reimbursements at the price paid by the general public even before the 2009 (and 2011) statutory amendments is belied by the legislative history we have quoted above. The conflict between the plan and its implementing legislation is not the subject of any analysis on the part of the parties, but we will not presume that the legislative history was in error. In addition, a 2011 communication between the Medi-Cal administrator and the CMS (of which the trial court took judicial notice) regarding a submitted amendment to the state plan describes the cap of the "usual and customary" charge to the general public on acquisition cost that was included in the 2009 legislation as being a "revised definition" (italics added) that was applied administratively in October 2009, before being subject to the injunction or receiving federal approval.
As for the two regulations ( Cal. Code Regs., tit. 22, §§ 51480 [prohibition on claiming reimbursement for "health *873care services" in excess of rate charged to general public], 51501 [charges for a "service or article" limited to "comparable" price paid by other purchasers] ) on which plaintiff premises an existing cap on reimbursement based on charges to the general public, the trial court concluded that these did not apply to the price of prescription medications. We do not need to resolve if this interpretation of the regulations is correct. Plaintiff does not provide any *529authority for his implied premise that the regulatory activities of the executive branch may proceed independently of any legislative authorization. The quasi-legislative actions of executive agencies are confined to the scope of authority conferred under statute. ( Henning v. Division of Occupational Saf. & Health (1990) 219 Cal.App.3d 747, 759, 268 Cal.Rptr. 476 [regulations contrary to statute are void]; see Tirapelle v. Davis (1993) 20 Cal.App.4th 1317, 1334, 26 Cal.Rptr.2d 666.) The statute here did not authorize a cap in the absence of federal approval. The same is true of section 51513 of that title, which does relate to "Payment for Legend and nonlegend Drugs" but is premised expressly on being in accordance with " Welfare and Institutions Code, Section 14105.45," or any interpretive Medi-Cal manuals on which plaintiff relies.
Consequently, the premise of plaintiff's false claim is lacking. Save Mart did not act contrary to any requirement under law in purportedly failing to limit its billings to Medi-Cal to the prices paid by cash customers. We therefore reject plaintiff's arguments to the contrary on appeal.
DISPOSITION
The judgment is affirmed. Save Mart is awarded its costs on appeal. ( Cal. Rules of Court, rule 8.278(a)(1), (2).)
We concur:
MURRAY, J.
HOCH, J.