Petitioner (sometimes herein called plaintiff) seeks by mandamus or prohibition to halt proceedings in a matter pending before respondent Industrial Accident Commission, until a final judgment shall have been reached in a superior court action in which recovery of damages is sought for the same personal injuries as are involved in the Industrial Accident Commission matter. Defendant in the superior court action claims, and plaintiff disputes, that the injuries were suffered while plaintiff was acting as defendant’s employe. We have concluded that a stay of the commission proceedings should be ordered.
Petitioner alleges that he is a minor, 19 years of age, and that on August 15, 1952, while on the premises of Pacific Coast Borax Company as an invitee, he suffered personal injuries through the negligence of such company. On December 23, 1953, through a guardian ad litem, he filed an action against the company in the superior court in Los Angeles, seeking recovery for his injuries. The company as defendant filed its answer. On October 19, 1954, pursuant to leave of court, defendant filed an amended answer, pleading as a fifth affirmative defense, “That the court herein has no jurisdiction of the action herein, the exclusive jurisdiction for injuries claimed by plaintiff being before the Industrial Accident Commission of the State of California.” On October 27, 1954, the cause was set for trial for February 1, 1955.
On November 19, 1954, pursuant to plaintiff’s motion to strike, the court struck the above quoted fifth affirmative defense from defendant’s amended answer. The issue of jurisdiction of the commission remained in the case, however, by reason of other allegations of the answer.
On November 23, 1954, defendant in the superior court action and State Compensation Insurance Fund as its workmen’s compensation insurance carrier filed with the Industrial Accident Commission an application for adjustment of claim 1 arising out of the same personal injuries as those *80 alleged by plaintiff in the superior court action, and at the same time requested a hearing thereon at the earliest possible date. This was the first proceeding filed with the commission in connection with the injuries, although it appears that immediately after petitioner was injured State Compensation Insurance Fund started paying his medical and compensation benefits under the Workmen’s Compensation Law of this state. These benefits, by December 23, 1953, the date petitioner filed the superior court action, totaled approximately $1,400 for compensation payments, in addition to the medical and hospital care.
On January 7, 1955, over petitioner’s request for a stay of proceedings by reason of pendency of the superior court action, a hearing was held before a referee of the Industrial Accident Commission, testimony was taken, and the matter was continued for further hearing to March 8, 1955.
On January 24, 1955, defendant in the superior court action moved for continuance of the trial therein, on the ground that “one of the main issues of the case is now being tried before the Industrial Accident Commission.” The motion was denied. On February 1, 1955, defendant’s, second motion for a continuance was likewise denied and the superior court action proceeded to trial on the same day. Following the close of the evidence defendant moved for a directed verdict on the ground that the evidence showed as a matter of law that plaintiff had been injured in the course of his employment by defendant and that the Industrial Accident Commission had exclusive jurisdiction of the controversy. The motion was denied; the cause was submitted to the jury; the jury failed to agree and on February 14, 1955, was discharged. Defendant thereafter moved for entry of judgment in its favor under the provisions of section 630 of the Code of Civil Procedure, on the same ground as it had moved for a directed verdict; the motion was denied on March 4, 1955; and the matter was set for retrial for June 14, 1955.
Following conclusion of the superior court trial in which the jury was discharged on February 14, 1955, petitioner again moved the Industrial Accident Commission to stay the proceedings before it and to continue the hearing set for March 8, 1955, but on February 24, 1955, his motion was denied by the referee who heard it. On March 8, 1955, petitioner filed this present stay proceeding with the District Court of Appeal. That court on March 24, 1955, issued its alternative writ of prohibition staying proceedings before the *81 commission, and on May 16, 1955, filed its opinion ordering the issuance of a writ of mandamus. We granted a hearing and transferred the cause for further study of the problems involved. It appears that in the meantime a second superior court trial has been had and on June 27, 1955, judgment of nonsuit was rendered against plaintiff; on July 5, 1955, plaintiff filed notice of appeal, and the appeal is now pending in the District Court of Appeal, Second Appellate District.
The question thus presented is whether the Industrial Accident Commission may, and should, be required to suspend the exercise of its jurisdiction in the proceeding before it because of the pendency of the action in the superior court or on appeal therefrom. The issue is not one of simultaneous exercise of general concurrent jurisdiction; it is, rather, the right of proceeding simultaneously in two tribunals, the jurisdiction of each of which is essentially exclusive of the other, but each of which has the power to make a determination of jurisdiction which, when final, will be conclusive upon the other.
General principles applicable to controversies in which the same parties and the same subject matter are involved are these: When two or more tribunals in this state have concurrent jurisdiction, the tribunal first assuming jurisdiction retains it to the exclusion of all other tribunals in which the action might have been initiated. Thereafter another tribunal, although it might originally have taken jurisdiction, may be restrained by prohibition if it attempts to proceed.
(Greene
v.
Superior Court
(1951),
In opposition to the granting of the writ respondent Industrial Accident Commission points out, however, that the rules laid down in the eases are stated to apply, and have been applied, in situations in which the first tribunal which exercised jurisdiction has such jurisdiction over the
same parties
and
subject matter,
could bring in any necessary new parties, and could do complete justice, dispose of the
whole
of the controversy, and afford all the relief sought. (See, e.g.,
Greene
v.
Superior Court
(1951),
supra,
In other words, as already indicated, the only point of concurrent jurisdiction of the two tribunals appears to be
jurisdiction to determine jurisdiction-,
jurisdiction once determined will be exclusive, not concurrent. (See
Abelleira
v.
District Court of Appeal
(1941),
The determinations of the commission, like those of the superior court, are res judicata in all subsequent proceedings, including court actions, between the same parties or those privy to them. (See Lab. Code, § 5302;
French
v.
Rishell
(1953),
Other practical problems, and differences between this situation and that of completely concurrent jurisdiction in two different tribunals, are said to be these:
1. In a jury trial of the superior court action, it appears that a special interrogatory on the question of coverage would (at least in the absence of special circumstances) be necessary in order to disclose what was determined on that point, in case of a verdict for defendant. Without such a special interrogatory it could not be ascertained whether the verdict turned on one of the other pleaded defenses of absence of defendant’s negligence, unavoidable accident, or contributory negligence of plaintiff, rather than on the issue of the employment relationship. This, however, it is answered, is a mere incident of procedure which can be handled in the trial court.
2. By the provisions of section 21 of article XX of the California Constitution the Legislature is “expressly vested with plenary power, unlimited by any provision of this Constitution, to create, and enforce a complete system of workmen’s compensation, by appropriate legislation . . . [including] full provisions for vesting . . . jurisdiction in an administrative body ... to the end that the administration of such legislation shall accomplish substantial justice in all cases expeditiously, inexpensively, and without incumbrance of any character-, all of which matters are expressly declared to be the social public policy of this State, binding upon all departments of the State government.” (Italics added.) Section 21 of article XX, California Constitution, further provides that “all decisions of any such tribunal shall be subject to review by the appellate courts of this State.” As to proceedings before such tribunal the Legislature has provided, in section 5502 of the Labor Code, that ‘ ‘ The hearing, unless otherwise agreed to by all of the parties thereto, shall be held not less than ten days nor more than thirty days after the filing of the application.” And sections 5313 and 5800.5 by their terms make mandatory a decision by the commission within 30 days after submission of the application. To stay the commission’s proceedings, *85 as here sought, it is urged would thus appear to defeat the intent and the letter of the Constitution and the statutes governing workmen’s compensation proceedings. The Constitution and laws of this state, however, still vest the superior court with jurisdiction to proceed in actions for personal injuries and, generally at least, to determine the facts upon which its jurisdiction may depend.
3. In view of the provisions of section 3755 of the Labor Code, permitting substitution of the employer’s compensation insurance carrier in lieu of the employer, and dismissal of the employer, in proceedings before the commission, it appears that the parties may differ in the commission proceedings from those in the superior court action. This is true, but it is merely another phase of the already recognized concept that the jurisdictions of the Industrial Accident Commission and of the superior court are exclusive, not concurrent, in every respect save as to the power to determine jurisdiction.
4. By the penalty provisions found in section 5814 of the Labor Code, “When payment of compensation has been unreasonably delayed or refused, either prior to or subsequent to the issuance of an award, the full amount of the . . . award shall be increased by 10 per cent. The question of delay and the reasonableness of the cause therefor shall be determined by the commission in accordance with the facts ...” It was pursuant to this assertedly applicable statutory duty that State Compensation Insurance Fund provided to the petitioner herein certain workmen’s compensation benefits up to the date petitioner filed the superior court action. If petitioner was injured outside the employment relationship then the Fund has no duty to provide continuing benefits. Further, according to the argument of respondent commission, if “petitioner should be further injured by one of the doctors furnished by the Fund, the Fund would be liable. If he is covered by the Workmen’s Compensation Act and he should become worse by the failure of the Fund to furnish treatment the Fund would be liable in that circumstance also. [See
Duprey
v.
Shane
(1952),
supra,
The factual bases for the above stated argument, insofar as they are enumerated, are indisputable. But there are other pertinent considerations: The insurance carrier or the employer, immediately upon the occurrence of a
*86
presumed industrial injury, and before or simultaneously with, the furnishing of hospital or medical care or compensation payments, may file with the commission an application for adjustment of claim or liability (Lab. Code, § 5501;
Giacalone
v.
Industrial Acc. Com.
(1953),
supra,
The commission particularly relies upon the case of
Giacalone
v.
Industrial Acc. Com.
(1953),
supra,
Also, reliance is placed by the commission upon the above quotation from 15 Corpus Juris 1165, which appears in
Williams
v.
Southern Pac. Co.
(1921),
supra,
The commission further relies upon the refusal of this court in the Williams case to grant the widow’s application for mandamus to restrain the commission from proceeding pending outcome of her superior court action. The complete opinion of this court reads: “The respondent commission is acting entirely within its jurisdiction in hearing and determining the application pending before it, and we have no
*88
authority to supervise its conduct of the proceeding in the manner suggested.”
(Williams
v.
Industrial Acc. Com.
(1919, Cal.),
Another point which is argued is that if an employer is not insured under the Workmen’s Compensation Law, then by the provisions of section 3706 of the Labor Code “any injured employee or his dependents may proceed against such employer by filing an application for compensation with the commission, and,
in addition,
may bring an action at law against such employer for damages, as if this division did not apply.” (Italics added.) (See also
Chakmakjian
v.
Lowe
(1949) ,
It has been suggested that to hold that the right to proceed in the exercise of jurisdiction shall depend on the fact of priority of invocation, will tend to promote a footrace to filing. It may be answered that initially both tribunals have jurisdiction to determine jurisdiction, and that if ulti *89 mate jurisdiction were to depend on the first final judgment, then we should still have the footrace but it would be a marathon rather than a sprint. With the law as it is, a race may be inevitable, but if it is, we prefer that it be a sprint.
We recognize, as we must in declaring the pertinent rule, that on occasion, conceivably, it may lead to hardship and to regrettable delay in administration of the benefits of workmen’s compensation. Just as one interested party may race to one tribunal, an opposing party may race to the other tribunal. For example, in cases where questions as to possible negligence of the employer, or as to the interpretation of a contract as creating a relationship of employer and independent contractor or employer and employe, or as to employe activity within the scope of employment, or as to employer or insurance carrier liability within the terms of a contract, are close, it may be that an employer (perhaps a self-insured one) would prefer to have those questions decided by the stricter rules governing court procedures and character of proof rather than the more liberal ones applicable before the Industrial Accident Commission. To that end, the employer might be encouraged to attempt to fix initial jurisdiction in the superior court by immediately filing a declaratory relief action in that court rather than an application for adjustment of claim by the Industrial Accident Commission. Such problems, if they arise, can be met. Perhaps the desirability of further legislative action is indicated. In any event the problem now is to declare a simple, workable rule upon the law as it exists.
We conclude that the general rule long recognized as governing tribunals whose jurisdiction is generally concurrent should be applied here where jurisdiction to determine jurisdiction is concurrent.
A question remains as to the nature of the relief to be granted. Petitioner has asked for either mandamus or prohibition. As noted hereinabove,
(supra,
pp. 81-82), the cases are almost unanimous in declaring that prohibition lies where proceedings are to be stayed in situations of concurrent jurisdiction. It has been suggested, however, in reliance on
Simmons
v.
Superior Court
(1950),
supra,
For the reasons above stated, let the writ of prohibition issue as prayed.
Notes
It should he noted that petitioner does not challenge the right of the company, as the claimed employer, to initiate the proceedings before the commission. (See
Giacalone
v.
Industrial Acc. Com.
(1953),
