OPINION
DONNELLY, Judge.1. This is an appeal from an order apportioning attorney fees and costs between Plaintiff and two claimants to monies recovered by Plaintiff following her prosecution of a tort action. Plaintiff contends that the trial court’s assessment of attorney fees and costs to Lovelace Medical Center (Lovelace) on its hospital lien and to the United States Military CHAMPUS Program1 on its claim filed July 13, 1993, was inequitable, and that the trial court erred in allowing Lovelace and CHAMPUS to recover on their claims out of the remaining monies held by her following the resolution of her tort action and the payment of her attorney fees and costs. For the reasons discussed herein, we reverse.
FACTUAL BACKGROUND
2. Plaintiff slipped on the ice while walking on the sidewalk of the First National Bank of Albuquerque, presently known as the First Security Bank (the Bank). She filed suit against the Bank alleging that it negligently maintained its premises. Following a bench trial, the trial court awarded Plaintiff damages in the amount of $30,450. The trial court, however, reduced Plaintiffs damages under the doctrine of comparative negligence to the sum of $15,225 because it found that Plaintiff was fifty percent comparatively negligent. Both Plaintiff and the Bank sought an award of costs; however, they each subsequently agreed to withdraw their cost bills, reserving the right to reassert their cost bills only in the event that the judgment was reversed and the case retried. In a separate appeal, this Court affirmed the trial court’s damage award by memorandum opinion in Cause No. 15,992 on February 6, 1995.
3. Plaintiffs attorney agreed to represent her in her personal injury claim against the Bank under a contingent-fee agreement whereby counsel was to receive one-third of any recovery, plus tax thereon, for work at trial, and forty percent of any recovery if an appeal was necessary. During the pendency of this action, pursuant to NMSA 1978, Section 48-8-1 (Repl.Pamp.1995), Lovelace filed a notice of hospital lien in the amount of $2561.36 on July 13, 1993, against Plaintiff. Lovelace filed an additional lien for $242.43 on June 30,1994. Because Plaintiff received medical benefits under a military CHAMPUS program, another claim was asserted by the United States against the Bank on July 7, 1994, for inpatient hospital care in the amount of $2475.76.2
4. After deducting the amount of her attorney’s fees in the amount of $6090, gross receipts taxes in the amount of $353.98, and costs of $7275.17, Plaintiff was left with a balance of $1505.85 from her recovery against the Bank.
5. On October 28, 1994, Plaintiff filed a motion requesting that the trial court equitably apportion the claims. Following a hearing on March 28,1995, the trial court entered an order stating that “the court values the reasonable cost of attorneys fees to ... collect accounts of the Lovelace Health Systems and Champús to be $1,000.00 if these bills were collected through the normal collection process,” and ordered that the claims of Lovelace and CHAMPUS be apportioned as follows:
Amount claimed Amount awarded
Lovelace claim $2803.79 $1803.79
CHAMPUS claim $2475.76 $1475.76
DISCUSSION
6. Plaintiff argues on appeal that the trial court erred in making its apportionment of the lien claim of Lovelace and the claim of CHAMPUS, and that the trial court’s method of apportionment resulted in a net loss to Plaintiff and exceeded the amount remaining from her recovery in the tort action. Because the facts are essentially undisputed, we review the trial court’s order to ascertain whether the trial court properly applied the law to the facts before it. Amica Mut. Ins. Co. v. Maloney, 120 N.M. 523, 527, 903 P.2d 834, 838 (1995).
7. The hospital lien statute, Section 48-8-l(A), authorizes the imposition of a lien on that part of the judgment recovered by the plaintiff “less the amount paid for attorneys’ fees, court costs and other expenses necessary thereto in obtaining the judgment.” In Martinez v. St. Joseph Healthcare Sys., 117 N.M. 357, 360, 871 P.2d 1363, 1366 (1994); and Amica, 120 N.M. at 529-30, 903 P.2d at 840-41, our Supreme Court held that if a plaintiffs attorney secures a judgment or settlement and a hospital recovers money due on its services without expending its legal resources, fundamental fairness requires that a hospital’s bills be equitably apportioned to allow it to bear a fair portion of the plaintifPs legal fees and costs from the common fund obtained by the plaintiffs efforts.
8. In Arnica our Supreme Court recognized two exceptions to the equitable apportionment of attorney fees. 120 N.M. at 529-30, 903 P.2d at 840-41. One, where the hospital actively participates or substantially contributes in pursuing the recovery; and two, where the lien claimants show that the amount of the plaintiffs attorney fees are unfair. Id. Under Arnica, in order for a lienholder to claim active participation in obtaining the judgment or settlement, it must demonstrate that it participated in the settlement negotiations with the insured for the entire settlement and substantially contributed to the total settlement award. Id. Under the “common-fund” doctrine, third parties who share in the benefits recovered by the plaintiff are required to proportionately contribute to the payment of reasonable attorney fees and costs expended in obtaining a recovery. Id.; Martinez, 117 N.M. at 360-62, 871 P.2d at 1366-68; see also Transport Indem. Co. v. Garcia, 89 N.M. 342, 344, 552 P.2d 473, 475 (Ct.App.) (attorney fees are paid out of the common fund because fundamental fairness should not require claimant to bear burden of all expenses and the risk of litigation), cert. denied, 90 N.M. 9, 558 P.2d 621 (1976). The trial court did not find either of the exceptions noted in Arnica to be applicable in the present case. See Citizens Bank v. C & H Constr. & Paving Co., 93 N.M. 422, 428, 600 P.2d 1212, 1218 (Ct.App.) (attorney’s contingency fee of 33]é% of amount of recovery held not unreasonable or unconscionable), cert. denied, 93 N.M. 683, 604 P.2d 821 (1979).
9. Plaintiff argues that instead of assessing a proportionate share of attorney fees and costs of prosecuting this case under the common-fund doctrine, the trial court utilized a formula which determined the cost of what it believed would constitute reasonable attorneys’ fees for collecting the lien claim of Lovelace and the claim of CHAMPUS. Plaintiff also contends the formula employed by the trial court failed to properly take into consideration Plaintiffs reasonable costs and expenses. We think Plaintiffs argument misconstrues in part the trial court’s ruling. Under the common-fund doctrine, a plaintiff who creates a pool of funds from a tortfeasor has the right to insist that others who seek to obtain payment from such pool make an equitable contribution for reasonable attorney fees and costs in creating the fund they seek to benefit from. See § 48-8-l(A). However, under the hospital lien statute, NMSA 1978, Section 48-8-3(B) (Repl. Pamp.1995), if a hospital hen claimant is required to enforce its hen claim through legal proceedings “the hospital may recover a reasonable attorney’s fee and the costs of filing and recording the hen.” Here, the trial court, in ruling on the matters before it, sought to consider the reasonable costs incurred by Lovelace in asserting its hen, and the amount CHAMPUS might have incurred if it had initiated legal proceedings to pursue its claim.
10. We beheve the trial court erred in calculating the amount to be awarded to Lovelace and to CHAMPUS based on the amount of legal fees and costs that the two claimants might have incurred had they elected to pursue such claims through the normal collection process. The apportionment formula apphed by the trial court resulted in a net loss to Plaintiff and sought to award more than remained in the unexpended common fund recovered by Plaintiff. Additionally, there is nothing in the record before us indicating that CHAMPUS was entitled to exert a lien under the hospital lien statute, or that it had a right to pursue any right of recovery against Plaintiff. Under the Federal Medical Care Recovery Act, 42 U.S.C. § 2651, the United States has a right to exert a claim against a third party who has negligently injured an individual to whom the government has furnished medical care and treatment. See United States v. Haynes, 445 F.2d 907, 908 (5th Cir.1971); Leatherman v. Pollard Trucking Co., 482 F.Supp. 351, 353 (E.D.Okla.1978). Under the federal act, the federal government’s right to recover against a tortfeasor can be exercised only if the party causing the injury is tortiously liable to the victim under state law. United States v. Neal, 443 F.Supp. 1307, 1311 (D.Neb.1978). No right of recovery by the United States is authorized, however, under the federal act against the injured party who was the recipient of care and treatment from the government. See United States v. Greene, 266 F.Supp. 976, 979 (N.D.Ill.1967); United States v. Ammons, 242 F.Supp. 461, 463 (N.D.Fla.1965).
11. In order to expedite the ultimate disposition of this case, we conclude that the balance of the monies remaining in the common fund should be paid to Lovelace pursuant to its hospital lien claim and in partial payment against the total amount claimed by it. Although Plaintiff correctly notes she is entitled to an equitable offset out of such fund for her attorney’s fees and costs expended in obtaining such judgment, this offset may effectively be matched by a like sum awarded to Lovelace for its attorney’s fees and costs in seeking to enforce its lien. See § 48-8-3(B).
12. Because CHAMPUS was not a party or intervenor to the proceedings herein and has failed to establish any right to a lien or to the remaining monies held by Plaintiff, we conclude that CHAMPUS is not entitled to any of the monies remaining in the common fund. See Carrington v. Vanlinder, 58 Misc.2d 80, 294 N.Y.S.2d 412, 415 (Sup.Ct.1968) (right of United States to recover on claim against tort-feasor is contingent upon it becoming party to action by intervention, joinder, or a showing that plaintiff has acted on its behalf). Nothing in this opinion, however, is intended to preclude Lovelace or CHAMPUS from pursuing other appropriate legal remedies to recover any additional amounts which may be owing to them.
CONCLUSION
13. For the foregoing reasons, we reverse and remand the order of apportionment and for entry of an amended order consistent herewith. The parties shall bear their own costs and attorneys’ fees incident to this appeal.
14. IT IS SO ORDERED.
HARTZ, J., specially concurs. ALARID, J., concurs.. Pursuant to 42 U.S.C. § 2651 (1988), the United States is authorized to seek recovery against a tort-feasor for the reasonable value of medical and hospital care furnished to a plaintiff covered by CHAMPUS.
. The term "CHAMPUS” means the Civilian Health and Medical Program of the Uniformed Services, as defined in 10 U.S.C. § 1072(4) (1988 and Supp. III).